Malicious PDF — malware analysis report

Static analysis result for SHA-256 41336c431427844d…

MALICIOUS

PDF

77.8 KB Created: 2021-04-18 23:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: fad33c4925ea51c9df3292710163a5ea SHA-1: ed74eef831b59668c37395ee0e9181348874d91d SHA-256: 41336c431427844d6f4862d1f68a45480986ec1bcbbbd88a0a9de95c4ac922ca
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to a tractor manual, intended to mask the malicious intent of directing users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/strik?utm_term=john+deere+750+tractor+owners+manual PDF link annotation
    • http://tixesikixux.mygamesonline.org/meriv.pdfIn PDF document text
    • http://testrun.ru/scotsman_prodigy_ice_machine_status_light_blinking_reding2y.pdfIn PDF document text
    • http://webdefilmizle.com/1162093827x7rva.pdfIn PDF document text
    • http://maturibcgj.space/ingersoll_rand_air_dryer_error_codesdi6mk.pdfIn PDF document text
    • http://xoziduso.mypressonline.com/53651023146.pdfIn PDF document text
    • http://shtampshop.ru/allahmme_ente_rabbi_la_ilahe_illa_enteu2k3s.pdfIn PDF document text
    • http://ses-paypal.com/sakuropuxumagodelodiupyx.pdfIn PDF document text
    • http://mesikigodijope.mypressonline.com/763881284.pdfIn PDF document text
    • http://begdas.space/what_do_the_different_colours_of_period_blood_meant1h35.pdfIn PDF document text
    • http://lebizifijafaxim.medianewsonline.com/89576163258.pdfIn PDF document text
    • http://sell-toclick.online/mitomebuwenopuwadisojapa1azi7.pdfIn PDF document text
    • http://biomanix.best/8194064348ukwso.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://best-ital.fun/what_is_self_destructive_depressionb737j.pdfIn PDF document text
    • http://fexevewuli.mypressonline.com/catholic_youth_bible_online.pdfIn PDF document text
    • http://tameenegypt.com/what_are_the_rules_of_differentiation_in_calculuswqj6w.pdfIn PDF document text
    • http://naturka.space/stock_market_breaking_news_twitterkvg22.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://18bc7be3-897e-46c1-a475-efc190d089bd.filesusr.com/ugd/62845f_f5687159a5854281872c8006177f201f.pdf?index=trueIn PDF document text
    • https://2c549fd3-bbcc-4e43-aea5-84609313cfd4.filesusr.com/ugd/c162b3_921ece69e3534c3ebadd9c30ef4225c5.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_off0000f1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BC 5608 bytes
SHA-256: 56a9fbb280bf637167d393c380cafe84d1ec61d8678c3c1a2aea9ef30a52fbe1
font_01_sfnt_off000104ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BA 10992 bytes
SHA-256: 869524b426661a73776c23fb94415ff72163b85850033be0eeae4381b88fc9bb

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