Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c158f14d770317…

MALICIOUS

PDF

104.1 KB Created: 2021-03-23 07:24:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: eec31d1d2764ccfc70ecb376343e0d1a SHA-1: bc6c6ffaeb9c46fb3d43dad3f614c01dbad74560 SHA-256: 66c158f14d770317850b327f24eae8ec77918dbba093c8aa72303171f324ae1f
196 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. The document contains a large number of external links, many of which point to SEO redirectors and link farms, suggesting an attempt to distribute malware or phish for credentials. The presence of external URIs and a link farm heuristic strongly suggests the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://dugedepap.ru/strik?utm_term=animorphs+books+how+many PDF link annotation
    • https://puwevifu.weebly.com/uploads/1/3/4/4/134465284/wefef-depefakejinuvom.pdfIn PDF document text
    • http://govnosiakxws.online/turbo_manual_de_guitarra_elctrica_descargar_gratiss0ta3.pdfIn PDF document text
    • https://semulojera.weebly.com/uploads/1/3/2/6/132695334/litusoniginugebasab.pdfIn PDF document text
    • https://cdn.sqhk.co/zoluxoni/iheTjaz/lexabojasevop.pdfIn PDF document text
    • http://kefets.xyz/10673522925ihgww.pdfIn PDF document text
    • https://wasatetokis.weebly.com/uploads/1/3/4/5/134513062/646c8138b3f1.pdfIn PDF document text
    • https://kimiligemapi.weebly.com/uploads/1/3/4/3/134343210/fekivawerisegeb.pdfIn PDF document text
    • https://wokusozevopiwaj.weebly.com/uploads/1/3/4/3/134381386/8960255.pdfIn PDF document text
    • https://cdn.sqhk.co/fexejikexew/DjejilR/86462571456.pdfIn PDF document text
    • https://menekagamop.weebly.com/uploads/1/3/4/0/134097565/xiladanizew-wafuderuwu-zuzanubisitov-vusokoxalemula.pdfIn PDF document text
    • https://junafoxotoroj.weebly.com/uploads/1/3/0/7/130738975/2697402.pdfIn PDF document text
    • https://rimozaruminipa.weebly.com/uploads/1/3/5/3/135391391/2947980.pdfIn PDF document text
    • http://quickpapp.online/616406030523au2j.pdfIn PDF document text
    • http://kvyovk.xyz/how_to_win_every_argument_review9w60a.pdfIn PDF document text
    • http://lnstagram-copyright-supports.com/55398846205oypih.pdfIn PDF document text
    • https://remofixar.weebly.com/uploads/1/3/0/7/130776049/db747555c45.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
    • https://s3.amazonaws.com/mokixetat/59105205469.pdfIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/samsung_sdr-b74301n_default_password.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/tofelawefubusa.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/generate_android_bundle_react_native.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/21861163090.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/movufataguzumi.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/vanebenavud.pdfIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/bovoxu.pdfIn 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_off00014cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CBF 5004 bytes
SHA-256: dbee1a3a333ad32eaf5d657a30e0180eb66002f99486133ab895b6bfe4fb9bfc
font_01_sfnt_off00015d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D80 11648 bytes
SHA-256: 3fe519c1be0509fc1648bb2414326957e79a2116754d864e44a2ceabe8ed8167
font_02_sfnt_off000184a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184A3 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f