Malicious PDF — malware analysis report

Static analysis result for SHA-256 238a959518d3b904…

MALICIOUS

PDF

90.1 KB Created: 2021-03-01 01:58:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b1af617288f8e93adf341f7ca65a4470 SHA-1: 17fb9849bdf4917f32a64f621b0f972e7531a67a SHA-256: 238a959518d3b904a0a6c4146b4cd86042f17621eea84c69989c54c3d7824507
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://resalured.ru/aws?utm_term=a+scanner+darkly+film+trailer PDF link annotation
    • https://jitebemaduk.weebly.com/uploads/1/3/4/6/134692965/lubidefumedozur.pdfIn PDF document text
    • https://ritojajugub.weebly.com/uploads/1/3/5/9/135984917/fivovotuguwo_wafudutuki_pikiriro_sajesaxovof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366385/normal_60250abd4449c.pdfIn PDF document text
    • http://vobalemujumojak.mywebcommunity.org/zigepitaziwuterejuru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378613/normal_602fa4746f6ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450154/normal_5ff1876db44a2.pdfIn PDF document text
    • https://xabisipejerifo.weebly.com/uploads/1/3/4/6/134634854/wukepotujeluwovema.pdfIn PDF document text
    • http://zonizubiro.getenjoyment.net/how_to_use_weber_propane_scale.pdfIn PDF document text
    • http://masovizifuzaro.iblogger.org/iphone_x_camera_mod_apk.pdfIn PDF document text
    • http://xoxuvajes.mywebcommunity.org/what_are_the_six_major_elements_found_in_living_organisms.pdfIn PDF document text
    • http://kazimibi.getenjoyment.net/what_is_the_best_free_golf_gps_app_for_apple_watch.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tikazujubetena.epizy.com/cellulose_acetate_membrane_sheets.pdfIn PDF document text
    • http://lepamiruketujuf.epizy.com/love_potion_number_9_sheet_music.pdfIn PDF document text
    • http://labutebumir.rf.gd/49437598006.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F2 5324 bytes
SHA-256: 10e46c32c1261fe476ccd314ee02e4eeb081eb1879d1a2171715da1046b68864
font_01_sfnt_off00012902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12902 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off00013465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13465 11592 bytes
SHA-256: 788ba7e3b88afdf42517a9825b3addbc66330b5113190d2e2ff26777925f41e7