Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a41cafa984867a…

MALICIOUS

PDF

73.0 KB Created: 2021-03-26 08:50:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0aac790c6591089b7f9c09aefb65a37b SHA-1: 5b42b44d4e553dc3ca0a6e109dd610eaa9b169e7 SHA-256: e3a41cafa984867ab988bffd7d87da00b31d845c9209e49dae713a539b68c4f0
184 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The document body is heavily obfuscated, but the presence of numerous links to disposable hosting services suggests a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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/123?utm_term=ozeri+blood+pressure+cuff+manual In PDF document text
    • https://mitivowa.weebly.com/uploads/1/3/1/6/131607237/zutezirotibumujote.pdfIn PDF document text
    • https://xapovakugad.weebly.com/uploads/1/3/5/3/135393008/jajolajalunan-papivuletuvepop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370768/normal_60556cd6dae12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486748/normal_6052f9e843f5e.pdfIn PDF document text
    • http://igonlinesupport.com/suntrust_finance_address2skxd.pdfIn PDF document text
    • http://biweekamnf.com/xadubilaratesejujuvjf00.pdfIn PDF document text
    • http://dugipoxumiku.iblogger.org/guardian_quick_crossword_answers_15207.pdfIn PDF document text
    • http://vodoroding.info/407096884689oin6.pdfIn PDF document text
    • http://espaceabonnes.com/dubejogapilebetolipuphvy88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380211/normal_6045721d658ef.pdfIn PDF document text
    • https://kerejokav.weebly.com/uploads/1/3/1/6/131637695/6276652.pdfIn PDF document text
    • https://gomimujetaveve.weebly.com/uploads/1/3/1/4/131406784/2cb854dd1208.pdfIn PDF document text
    • https://koverirenupoma.weebly.com/uploads/1/3/4/7/134747520/vedanax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366004/normal_6007b92eefcba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8423f4a8-1f5d-4cd0-a591-eb2e6b224181/93335619230.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/66957308803.pdfIn PDF document text
    • http://tazododamir.rf.gd/samrat_ashoka_serial_all_episodes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3385456-5ebf-433c-bb11-6bdef8a72ba7/kanuvo.pdfIn PDF document text
    • http://supikovibamukip.epizy.com/7562546295.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/rowarefalenararezotili.pdfIn PDF document text
    • http://zowipazivavi.epizy.com/quenching_medium.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/749977c0-fb37-4eb2-91a8-417d444dee4a/ap_literature_multiple_choice_practice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e928a82-d1ef-4ee8-8967-36338d24016c/how_did_the_alliance_system_lead_to_the_start_of_wwi.pdfIn PDF document text
    • http://tojederetesez.epizy.com/zixaxonunibumo.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4B 5516 bytes
SHA-256: dd8a67651a9031b1016416a1201aa0db0f859e509fe1863d22484fa260825169
font_01_sfnt_off0000f1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F4 10772 bytes
SHA-256: 53bc02128128385f10a87c236c9ac25a806d0f5eb95cc3945c9688c307bd3de5