Malicious PDF — malware analysis report

Static analysis result for SHA-256 866e5322edc9f028…

MALICIOUS

PDF

75.0 KB Created: 2021-03-15 07:25:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 95368aa2368ad0ba5837e69a5123525e SHA-1: 9ff0af789c19ef36038ebef639f372e0f4b9223d SHA-256: 866e5322edc9f028d5b91ffffd79fde08a60eee59bd2b2d7e79099410095c25f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or link farm attack. It contains numerous external links, many of which are embedded within the document's body, disguised under a seemingly innocuous topic related to genetics worksheets. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, suggesting an attempt to manipulate search engine results or direct users to malicious sites. No scripts were extracted from this sample, but the overall structure and heuristic firings strongly suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://soxebez.ru/wix?keyword=mendelian+genetics+punnett+square+worksheet+answers
    • https://cdn-cms.f-static.net/uploads/4499999/normal_602093a193605.pdf
    • https://cdn-cms.f-static.net/uploads/4415770/normal_603827c412207.pdf
    • https://cdn.sqhk.co/ruvonusebex/jMgd0jc/degopenotajeve.pdf
    • https://zarojapejafaro.weebly.com/uploads/1/3/5/3/135347044/lubafewu.pdf
    • http://kazimibi.getenjoyment.net/mawukunomopodenod.pdf
    • http://bafedudovodamo.medianewsonline.com/xatodakuxu.pdf
    • https://cdn.sqhk.co/murafabu/aiiTZgi/100_sounds_for_baby_app.pdf
    • https://cdn.sqhk.co/napefabet/1cgijkU/oconus_security_clearance_jobs.pdf
    • https://cdn-cms.f-static.net/uploads/4390052/normal_603722d0a945a.pdf
    • https://cdn-cms.f-static.net/uploads/4492275/normal_602a4e50f0430.pdf
    • https://cdn.sqhk.co/momujolo/VgfTjhF/wobilu.pdf
    • https://bovuxugiz.weebly.com/uploads/1/3/4/9/134901291/c57a196.pdf
    • https://cdn.sqhk.co/minofavazu/Oyjigdu/best_slasher_movies_of_all_time_ranked.pdf
    • https://rodinesupogoj.weebly.com/uploads/1/3/1/3/131384539/6798032.pdf
    • http://wusator.mygamesonline.org/analise_swot_exemplo.pdf
    • https://cdn.sqhk.co/niramojiga/fGRjho5/guess_the_word_with_clues.pdf
    • https://sowekunozo.weebly.com/uploads/1/3/5/3/135321923/7522894.pdf
    • http://jidogirikar.mygamesonline.org/a_room_of_one_s_own_chapter_2.pdf
    • https://cdn.sqhk.co/lusoxepero/fjeVidB/download_unlimited_free_vpn_chrome_add_on.pdf
    • https://static.s123-cdn-static.com/uploads/4366630/normal_5ff785176e57d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pogolo/lotus_sutra_mantra_in_english.pdf
    • https://s3.amazonaws.com/juliziwojatige/rebevazago.pdf
    • https://s3.amazonaws.com/dopugaxelelema/rewovapijatosilu.pdf
    • https://s3.amazonaws.com/dobikasukavu/anomalias_cardiacas_congenitas.pdf
    • https://s3.amazonaws.com/ladiwuzetawedi/capoeira_songs_lyrics.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_off0000e779.bin
b80621a21ae77762246f5013fd631bdff73775ac96a1bb21b17eadc6bf8c51a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE779 5624 bytes
font_01_sfnt_off0000fab1.bin
2e7d3579e537f145e948661dc2721de83f1504fda79a24e42e7a97286ccece88		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB1 10428 bytes

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