Malicious PDF — malware analysis report

Static analysis result for SHA-256 bda6c1bb6a1f2bd8…

MALICIOUS

PDF

86.2 KB Created: 2021-02-05 17:42:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 09cfe26cd5de9558963eb31982cec256 SHA-1: 91d5c998c8ed322a3dfd757adc7750143100cd4e SHA-256: bda6c1bb6a1f2bd8fe35c326ff98bcf58dae82a906e21f60a26cfb15bd64c8d8
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, specifically flagging it as a redirector and a link farm. It contains numerous embedded URLs pointing to potentially malicious or phishing sites, including a known malicious redirector. The document body is heavily obfuscated and appears to be a lure, likely intended to drive traffic to these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • 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.
  • 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://crophysi.ru/123?utm_term=the+birds+novel In PDF document text
    • https://static.s123-cdn-static.com/uploads/4460066/normal_5ff11030ab373.pdfIn PDF document text
    • https://cdn.sqhk.co/wodabakope/9ojahe6/31568881001.pdfIn PDF document text
    • https://cdn.sqhk.co/dutebevon/j7Fjjig/61697449364.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411918/normal_5fd844af897b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465128/normal_5fe37f8481380.pdfIn PDF document text
    • http://muslims.net/4052643780fj3yo.pdfIn PDF document text
    • http://gromstroy.com/vegas_insider_nba_injury_reporttor9p.pdfIn PDF document text
    • https://fipamowusaki.weebly.com/uploads/1/3/4/8/134879766/xedafaxefopet.pdfIn PDF document text
    • http://mebelrostov.ru/bunny_runny_nose_and_eyes_burningyezre.pdfIn PDF document text
    • https://cdn.sqhk.co/kazaluxi/hheJjfH/apache_helicopter_air_fighter_modern_heli_attack.pdfIn PDF document text
    • https://fometixivoros.weebly.com/uploads/1/3/1/6/131637143/4866292.pdfIn PDF document text
    • https://cdn.sqhk.co/lofakekaf/ghugfgi/euro_train_simulator_mod_apk.pdfIn PDF document text
    • https://vorexumezekadan.weebly.com/uploads/1/3/0/9/130969740/sozewaxefesu.pdfIn PDF document text
    • https://cdn.sqhk.co/nonuripot/gihijiQ/funny_tricky_riddles_with_answers_in_telugu.pdfIn PDF document text
    • https://tosofeguwus.weebly.com/uploads/1/3/4/3/134321705/d56cd66bb3f9.pdfIn PDF document text
    • http://scarcebook.com/english_grammar_nouns_worksheets0kbqp.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/Mja4jeP/94202009344.pdfIn PDF document text
    • http://white-x.fun/brilliant_screening_test_sample_papers_for_class_10ih2hu.pdfIn PDF document text
    • http://cccckkkkkdd.space/object_pronounsdec04.pdfIn PDF document text
    • http://13millions.store/mage_hero_denied_reviewayj9y.pdfIn PDF document text
    • https://xawavefite.weebly.com/uploads/1/3/4/6/134667803/3172193.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413712/normal_5fe3932ab4bb0.pdfIn PDF document text
    • https://cdn.sqhk.co/wemorapi/dc6imgj/tulekudebewixenum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C9 4560 bytes
SHA-256: 47e15c91a39fca3602e0bf24772bacadfdb19c17fb889d64acf5d7bdc8fca597
font_01_sfnt_off0001182c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182C 10844 bytes
SHA-256: 4e72ccad5d50f4f574deb3108b8035f0892e564b4d1396511ec8f8b6035cdc69
font_02_sfnt_off00013d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D1B 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f