Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d1838e41d3a0ad0…

MALICIOUS

PDF

87.2 KB Created: 2021-03-20 11:42:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 65a41664b4f35b956910e62ce0aa459d SHA-1: 8652e8f35ab956363b6e5708ab03c90036e2675d SHA-256: 8d1838e41d3a0ad052e2d4092face3eb9ce6669a18df48acf8cbc7b09aac6efe
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF file that contains multiple external links, with one prominent link pointing to 'maypoin.ru'. Heuristics indicate a PDF link farm and a lure for MFA or one-time code harvesting, suggesting a phishing or credential theft attempt. ClamAV also detected it as Pdf.Phishing.Trojan.

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
  • 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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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/123?utm_term=vw+blaupunkt+radio+code+generator PDF link annotation
    • http://lalashoppen.online/fevatuneponakowi591m.pdfIn PDF document text
    • http://lurubalopare.sportsontheweb.net/what_does_the_woodcock_johnson_iv_measure.pdfIn PDF document text
    • http://fujigukatujewu.medianewsonline.com/2137236269.pdfIn PDF document text
    • http://clubstore.pro/ti_84_calculator_walmart_priceurnwf.pdfIn PDF document text
    • http://gosugas.getenjoyment.net/kuxedifikub.pdfIn PDF document text
    • http://republvinb.fun/visedagazixaboduxavi7fhcb.pdfIn PDF document text
    • http://jafoxidulez.mypressonline.com/react_js_tutorial_for_beginners_step_by_step.pdfIn PDF document text
    • http://figimumagoko.mygamesonline.org/biwunubinivikusiwuroz.pdfIn PDF document text
    • http://waxedeb.getenjoyment.net/benaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/suxiweke/vezozevatabubawix.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/pugiwizikurovepivuvune.pdfIn PDF document text
    • http://zizenatoxu.myartsonline.com/the_wu_tang_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/online_ms_word_document_editor_free.pdfIn PDF document text
    • http://pudosuvosav.atwebpages.com/how_much_does_a_wolf_wall_oven_cost.pdfIn PDF document text
    • http://sawesupunozigiv.atwebpages.com/59290857615.pdfIn PDF document text
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_c7eca54cdfd0472186bbb0cc0135fb89.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/breath_holding_attacks.pdfIn PDF document text
    • http://mojenuj.atwebpages.com/rejebagudejogipodu.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/94208224140.pdfIn PDF document text
    • https://0ea1ff7f-05b3-43a2-9744-178351a05ed1.filesusr.com/ugd/01f9b9_192d91a07ee14c1a865764f31d220011.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/tuzinagimesewitaluwanekib.pdfIn PDF document text
    • https://c18d7360-3707-4bf1-9d6f-52ba7510fa17.filesusr.com/ugd/76cb06_6d1384c6ff424f078108b9fa96f8d50b.pdf?index=trueIn PDF document text
    • https://6c892e0d-5736-4b4a-96a3-cd490fd1fe3d.filesusr.com/ugd/1407cd_da9e912dedb444eb8c6564dda225a9b1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jeponowon/77239444451.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A5 5324 bytes
SHA-256: b4c414f47bc89c4a8727bd58e0c5cf16d304a9b0eca4a4054ce1865ba12abc07
font_01_sfnt_off000124e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E7 13380 bytes
SHA-256: c4d2c467e8e619cac412f8feb58e39dca860ee308a0c8a297793442848077ecc

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