Malicious PDF — malware analysis report

Static analysis result for SHA-256 178653d75652af4f…

MALICIOUS

PDF

81.5 KB Created: 2021-03-25 15:06:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 305eb76fdabdf6ead3a6247314150fe1 SHA-1: d233e2fc21c609f73e35a5d29466782ab0459cc0 SHA-256: 178653d75652af4faf7876457619de9c253ba5423b2dd3b746364404d7fc1d2f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV. It contains a significant number of external links, with one heuristic specifically flagging it as a 'PDF_SEO_LINK_FARM'. The document body, though heavily obfuscated, suggests a lure related to a 'guide'. The primary IOCs are the external URLs found within the document, which are likely used for redirection or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://fokemale.ru/123?utm_term=wow+wotlk+arcane+mage+pvp+guide
    • https://cdn.sqhk.co/rubogomuweme/iggeI3M/kajataribafatulumalibi.pdf
    • https://jinijazi.weebly.com/uploads/1/3/4/6/134668286/36c8779ccd33d.pdf
    • https://vafumesaz.weebly.com/uploads/1/3/4/5/134589630/5933821.pdf
    • http://easterthjg.com/geek_smarter_shopping_sitecpi1l.pdf
    • https://cdn.sqhk.co/buzovegom/BhbuRco/connacht_football_championship_2019_final.pdf
    • https://cdn.sqhk.co/rorazelesu/igBR2eD/auxiliary_verb_worksheet_for_grade_6.pdf
    • https://tezubowaxax.weebly.com/uploads/1/3/4/6/134640868/foritatosa-vijos.pdf
    • https://wodokapiv.weebly.com/uploads/1/3/4/5/134584818/darunegevogig_tiposesidom_kaves_nafopadozidap.pdf
    • http://usersonlineguardingsettings.site/drug_information_a_guide_for_pharmacistsbvcss.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wuvipaxafosi.rf.gd/kazofawabemus.pdf
    • https://uploads.strikinglycdn.com/files/0d9b4d53-4d01-49d9-b9b2-c22bdb3cbc1e/42306252703.pdf
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_d3ca2f73243047cf8d39adc609d31d84.pdf?index=true
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_f268ccabe4f2443e8dbf3fdd749aca13.pdf?index=true
    • https://uploads.strikinglycdn.com/files/df62ed72-96b5-44da-9eba-ac22afda1849/64005197339.pdf
    • https://uploads.strikinglycdn.com/files/58499ec7-a9b1-44a5-a47d-745d9b4f864b/kopujalasuzidosutesurevu.pdf
    • http://notavopanugatog.epizy.com/39051263199.pdf
    • https://uploads.strikinglycdn.com/files/d8ed8c17-2988-4c36-add7-38358676f61b/41317672666.pdf
    • https://4c6480a9-ccec-4c20-853c-cc48681c44ad.filesusr.com/ugd/935adc_65f55feed3f947b191674f5962fc9f6f.pdf?index=true
    • http://pagupugizof.epizy.com/chala_head_chala_portugues.pdf
    • https://ad858f6a-7bbb-416d-9365-e04d7986ed9b.filesusr.com/ugd/3c9ac1_4a053859fe2341a6b68e3f8639364c6e.pdf?index=true
    • http://weribemuludozeb.epizy.com/how_would_you_describe_the_climate_of_the_philippines.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_off0000ff0c.bin
ec0999d47d86fa7d4389d9ad9401181577498eac3516f2471b73660af35ba0fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0C 5444 bytes
font_01_sfnt_off00011199.bin
cff6da92bde77741281bf01a084d5957a8e7af717248b24db12811e93ebe00c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11199 10836 bytes

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