Malicious PDF — malware analysis report

Static analysis result for SHA-256 abd3923b9d38bee7…

MALICIOUS

PDF

82.7 KB Created: 2021-04-21 04:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e049876f2373830caf5da7ea01a49bf8 SHA-1: 8503e3fc47e243033c08e7e8b11b53278b46f8b1 SHA-256: abd3923b9d38bee78f3735efbfc195f75fa3a9c82e2e79899ab726c1d30e2f16
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/strik?utm_term=hialeah+gardens+high+school+bell+schedule In PDF document text
    • http://fivabigenarewo.22web.org/in_my_room_song.pdfIn PDF document text
    • http://nujofojif.iblogger.org/sababa_adeena_sussman.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366406/normal_6046224dc9417.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393029/normal_60620fc83caf0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375531/normal_5fdcc9bd6a7e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451941/normal_600a6ca8ab99a.pdfIn PDF document text
    • http://zoguponuwuxoli.medianewsonline.com/the_river_wild_movie_wikipedia.pdfIn PDF document text
    • http://vataponuxizeliz.mywebcommunity.org/81769799301.pdfIn PDF document text
    • http://jipegogujozu.22web.org/deadlock_handling_in_os.pdfIn PDF document text
    • http://vozaxakinexu.iblogger.org/jekaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://df4002df-ed14-466c-b758-10ced248c840.filesusr.com/ugd/3b03e6_1eee31365df8407f9c0875cf837137c2.pdf?index=trueIn PDF document text
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_86a615f730c54a93a246b43109fc5572.pdf?index=trueIn PDF document text
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_780613b2b22649889db2c1d20854aa4d.pdf?index=trueIn PDF document text
    • https://8f20b4bd-83f7-4a55-8c6f-e9501e2e061c.filesusr.com/ugd/c1c462_88f8d2ede5b044b3991a710aa3919353.pdf?index=trueIn PDF document text
    • https://684917c6-b594-4497-9ea4-141105166a5b.filesusr.com/ugd/0dc9f5_cc27b433919048b192d624288c9de5e2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bupijila/wisconsin_badgercare_plus_hmo_program_guide.pdfIn PDF document text
    • http://nokemineviwekus.rf.gd/how_do_the_disney_internship_working_full_time.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/streamlined_energy_and_carbon_reporting_legislation.pdfIn PDF document text
    • http://pesetunal.onlinewebshop.net/68723349267.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/how_to_pass_new_york_driving_test.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/convert_base64_to_react_native.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/angry_birds_transformers_codes_2018.pdfIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_4a12a7da97754a9aa0c4a633a78c6b9f.pdf?index=trueIn PDF document text
    • https://92fa68c6-d088-48c5-94d9-776fe0504fc0.filesusr.com/ugd/5a053b_4a631b8586e4450097410f1b7546d4e3.pdf?index=trueIn PDF document text
    • http://lipabarud.atwebpages.com/gapokaxivebitufepomavawub.pdfIn PDF document text
    • https://535a9070-e28a-464b-adc5-c02ad08be00b.filesusr.com/ugd/9df9d6_d57d36652ebd43df8a155f0dbdf72048.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AE 5104 bytes
SHA-256: 5dc1ad4cf34c8ae40f2046bb5f137eadc3b97656e1eedbacf658880039deef4f
font_01_sfnt_off000107de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DE 11260 bytes
SHA-256: 9f98526a0a344818eba82986c7c8b4e10d9d058da3faa1956ec12a500d354256
font_02_sfnt_off00012e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6E 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34