Malicious PDF — malware analysis report

Static analysis result for SHA-256 35bb1dc62419256b…

MALICIOUS

PDF

74.7 KB Created: 2021-05-13 15:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d7a22d181b0789336310d25e7839a731 SHA-1: 3059c59ba5dce57251e99fee3534bf0a2c9c0aef SHA-256: 35bb1dc62419256b1d57f060bc41f3fc76c4e788ecc4b13b19cdb49dc7b218d4
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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.
  • 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://baarspo.ru/strik?utm_term=amazing+grace+my+chains+are+gone+chords+pdf PDF link annotation
    • https://cdn.sqhk.co/xaranoraf/jmRWjbi/repost_for_instagram_app_instructions.pdfIn PDF document text
    • https://cdn.sqhk.co/dolafita/XEEicib/nejikalenawufugujosutiki.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/0EgghaT/subway_endless_train_surf_run.pdfIn PDF document text
    • https://wufikaxom.weebly.com/uploads/1/3/4/8/134883002/keturekup_vugijurax_rezemofavuvume_depomemos.pdfIn PDF document text
    • https://cdn.sqhk.co/gabisolovima/id5gjq3/clueless_cast_now.pdfIn PDF document text
    • https://cdn.sqhk.co/fofanibiv/jeGmQgc/detiwib.pdfIn PDF document text
    • https://papazutizo.weebly.com/uploads/1/3/4/4/134467207/4882003.pdfIn PDF document text
    • https://cdn.sqhk.co/xoxapivasif/QhhEFYO/pixel_unicorn_pixel_art_color_by_number_unblocked.pdfIn PDF document text
    • https://luralaxigagu.weebly.com/uploads/1/3/4/8/134868525/f7ac99e2e.pdfIn PDF document text
    • https://tefegepivovopuf.weebly.com/uploads/1/3/5/3/135311357/5573161.pdfIn PDF document text
    • https://safasisi.weebly.com/uploads/1/3/4/4/134472516/wokirotulej_todineme_zinepu.pdfIn PDF document text
    • https://cdn.sqhk.co/pulobegefuzi/j7iezGm/84506406831.pdfIn PDF document text
    • https://cdn.sqhk.co/fabunavaxa/rgfihid/free_advertising_campaign_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_0aafb21139b240fdb363dc4867427388.pdf?index=trueIn PDF document text
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_9b459b88819b49799ff36eb76b13938d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/39e42dbd-6c60-4277-a7e6-8a7c3be486ee/potipaxilidufubegite.pdfIn PDF document text
    • https://2065f6f1-29fb-48ac-a230-4f4ab2d4b746.filesusr.com/ugd/b62953_10f05bd809024207a892057e4559d885.pdf?index=trueIn PDF document text
    • https://4dcfe184-cd6c-48f8-9f23-5461c743a1d4.filesusr.com/ugd/cc8533_6eb7c057d7144ac58cc9431a51d304ed.pdf?index=trueIn PDF document text
    • https://d321836a-1bf8-47c4-b4d3-67fe1e7f0250.filesusr.com/ugd/33ab24_6167f6cdaf6c4de8b379c6d0d6fd0327.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/260dc9a4-e479-403e-bb75-ba4f06d03b46/what_does_cronbachs_alpha_based_on_standardized_items_mean.pdfIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_77e2812925734b72923c8992a261ca54.pdf?index=trueIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_b6ffe47446b94f14892552ec43363ee6.pdf?index=trueIn PDF document text
    • https://1b3fde16-7575-45ba-b40e-8916c64185ca.filesusr.com/ugd/8874e8_96990285d0f8409b9f3b1c15bae75081.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38B 5680 bytes
SHA-256: 30fb660ed363df74e9d60134fd3264d596a0fdb33aafc4ade570586911d9f1f9
font_01_sfnt_off0000f6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C2 11188 bytes
SHA-256: 8bc55717fecebf4b9be9a34066599bbc63b27d8df802f0c0eac773cd8a77357f