Malicious PDF — malware analysis report

Static analysis result for SHA-256 72f13fa2104adf2a…

MALICIOUS

PDF

81.6 KB Created: 2021-03-21 04:46:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 63da1644dfe85ac512e19bafebbaa3fc SHA-1: d076e4684b4038064889435b8ef17fafba526c35 SHA-256: 72f13fa2104adf2a38ecc2cdbcf91c1ccbb3810504f9bbf23b64a48d70c7565d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as relevant documents but lead to unknown or potentially malicious sites. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, a common tactic for SEO manipulation or to host phishing pages. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/wix?keyword=va+manual+underwriting+guidelines+2019
    • https://sifufunozomelu.weebly.com/uploads/1/3/4/7/134764248/xufavabokas-tiluxej-veruvakewawa-ramekupabe.pdf
    • http://jidogirikar.mygamesonline.org/27058242951.pdf
    • http://swiss-gear.store/how_to_reset_epson_xp_200_printerf166l.pdf
    • http://jujovobima.getenjoyment.net/wagonuposanomabevisutoror.pdf
    • https://wowaximemufa.weebly.com/uploads/1/3/1/4/131453960/050d177f48cb9.pdf
    • https://tivufotevomok.weebly.com/uploads/1/3/2/6/132682035/mumadelosob.pdf
    • http://workbykoder.xyz/how_to_replace_hose_on_bissell_proheat_2x6wb57.pdf
    • https://pexafibilo.weebly.com/uploads/1/3/4/4/134484824/texesalub.pdf
    • http://totipuzuforaz.mywebcommunity.org/kovize.pdf
    • http://opt05.ru/65293491878xst6h.pdf
    • http://blacklaser.ru/55244757228b1cod.pdf
    • http://ourfanz.com/lasibipugidalp6u1e.pdf
    • https://tixemuxizufog.weebly.com/uploads/1/3/4/7/134746981/zavinevu_nezikabaw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://be934b08-0dcc-4e2e-8de1-c3c1c32dbfab.filesusr.com/ugd/d5415a_9b2490dcc4404a208754ac0cd0660dc2.pdf?index=true
    • https://5e446c31-fcb6-4427-a178-91ee45bbff8b.filesusr.com/ugd/4e76b8_019d9b96eacf432b91675fa17464bbaf.pdf?index=true
    • https://uploads.strikinglycdn.com/files/61628ac9-db35-44a3-a15a-87f5f9648d2b/baby_bjorn_travel_cot_age_limit.pdf
    • http://vawirir.atwebpages.com/joindre_un_dans_word.pdf
    • https://s3.amazonaws.com/dozore/76574314111.pdf
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_ba37c682ddf54d1b9b5141386d9056cc.pdf?index=true
    • https://4f7f339c-9ee9-4921-a7ad-794169edd555.filesusr.com/ugd/fea72b_e4d0e51f04c84aae8584b362b18c4180.pdf?index=true
    • https://s3.amazonaws.com/zubuwujoxom/motorola_elite_sliver_battery_replacement.pdf
    • https://uploads.strikinglycdn.com/files/f63adc25-0ec9-4ed0-a2f4-3911c0de5db1/how_to_take_professional_pictures_with_iphone.pdf
    • https://uploads.strikinglycdn.com/files/3c9e31c4-efda-462c-a24c-53f5cb527838/pilajexiwifexavutomita.pdf
    • https://s3.amazonaws.com/xisakazelelinim/are_flotec_pumps_any_good.pdf
    • https://71fc3d66-43b2-4ae0-adc3-dfbcdf8b5360.filesusr.com/ugd/6605a0_9a361d98787947848df6b7eff53d8be9.pdf?index=true
    • 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_off0000fd94.bin
e8ce0404bb6182aea7ad9232d27a83c0743fdb5f5dfd84ae1d6e4382b89dea8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD94 5684 bytes
font_01_sfnt_off000110ee.bin
443c04acc9041a262cc4a18d7f5a75a77aad90a2e7e847b52c7d177e92df976a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110EE 11396 bytes

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