Malicious PDF — malware analysis report

Static analysis result for SHA-256 36e901af92e0f3ad…

MALICIOUS

PDF

69.1 KB Created: 2020-12-11 17:16:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 222fcfac040257e2233920d5d5b3864f SHA-1: 7412a0bba2504ef1aa4bc8139aaf4d73619269e6 SHA-256: 36e901af92e0f3ad2a73c6ae85c701f32415c6a1c539fc7ba831479653098807
214 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for linking to known malicious redirectors and for containing a large link farm, indicating a phishing or SEO manipulation attempt. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the embedded URLs suggest an attempt to lure users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ggtraff.ru/strik?utm_term=frontal+release+signs+video
    • https://cdn-cms.f-static.net/uploads/4476582/normal_5fbdb82310c26.pdf
    • https://limikasideg.weebly.com/uploads/1/3/4/4/134446439/fd00b2662aa.pdf
    • https://cdn-cms.f-static.net/uploads/4390323/normal_5f989cbe2b6f3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4a65173fb5383b9869c1/1606371942011/recaro_car_seat_fitting_guide.pdf
    • https://uploads.strikinglycdn.com/files/74248f05-49e5-47ec-9111-71809022fbfe/51199211770.pdf
    • https://static1.squarespace.com/static/5fc0dd131452f90b7fe52ecb/t/5fc0f31018e72e5fdbf983bd/1606480661958/22863471070.pdf
    • https://static1.squarespace.com/static/5fc7ab0310d6a92a736d7bc1/t/5fce02d4662d5e24e0c7a41c/1607336661963/gun_fu_stickman_2_hack_apk.pdf
    • https://static1.squarespace.com/static/5fc19093ff13940aa2445166/t/5fc59d7561e25426e1f8fb97/1606786422571/m249_army_study_guide.pdf
    • https://static1.squarespace.com/static/5fc0f5b088c99b6d37a76c18/t/5fc4123c5147b14804b23119/1606685244843/noloxopexopix.pdf
    • https://s3.amazonaws.com/pozokimepe/niper.pdf
    • https://s3.amazonaws.com/potofaw/sowadozawemubejirezir.pdf
    • https://static1.squarespace.com/static/5fc106d1bf71053ccb10e0e5/t/5fc7156c7995075abddc1037/1606882671235/birthday_cake_ideas_for_male_60th.pdf
    • https://s3.amazonaws.com/fojaxexino/printable_star_template_large.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2ce.bin
ea9e166cfb0d8260d30fab44e4e29a267bb63219de569670fb8b31ffbd568e62		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CE 5008 bytes
font_01_sfnt_off0000e3e9.bin
1a1297b7eac14bb8694777b5baa5835612b96dec231fd73d8af76eb7ab178c5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E9 10736 bytes

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