Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a1c36ef1db8f8e…

MALICIOUS

PDF

87.2 KB Created: 2021-03-12 15:11:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1c73f41e1bd72dcacb16b05c2dd416ae SHA-1: 5dcf76b2b3bf395621602c59cb1e15a2febef4f9 SHA-256: b5a1c36ef1db8f8e4329befc7a60581e56dea5388799ea89554659b125a64485
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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://resalured.ru/award?keyword=alpha+male+strategies+book+pdf+download PDF link annotation
    • https://lulodepi.weebly.com/uploads/1/3/0/7/130776712/3e0f9ea587a1c46.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489245/normal_5ff56531297c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385204/normal_603704a0dec01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365547/normal_5fe801e55fe70.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420434/normal_5fc57da638a4e.pdfIn PDF document text
    • https://lufiwusogak.weebly.com/uploads/1/3/4/3/134319395/841554.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487662/normal_5ff411a6f192c.pdfIn PDF document text
    • https://jelonuzekuxenu.weebly.com/uploads/1/3/2/8/132814084/2874592.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_343dd75036744f1bb143c0ea0637ed42.pdf?index=trueIn PDF document text
    • http://kibowetesuve.rf.gd/pijixinese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8c3f3dd-05b5-44f6-8563-41a2228c1da8/mabezokela.pdfIn PDF document text
    • http://xivutunitilema.epizy.com/android_tv_box_4k_magicsee_n5.pdfIn PDF document text
    • http://rojapamun.epizy.com/11203681292.pdfIn PDF document text
    • https://3485775d-af35-4505-8fb4-f6750f575e04.filesusr.com/ugd/42f18e_852fe32ec6ad477c9462ef1f3688aed3.pdf?index=trueIn PDF document text
    • https://62abf401-5fc9-4991-ac00-cb6a0c8cf8ec.filesusr.com/ugd/e4ff69_99b074836a534eb6b3e11bd1fe922329.pdf?index=trueIn PDF document text
    • http://mevusajilitum.rf.gd/gakatog.pdfIn PDF document text
    • http://fanunif.rf.gd/nakipotagubekivibijalonuv.pdfIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_320e4ed8532345cc8c8901ef4f40c7fd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/4_part_harmony_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/75510001728.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/130dcdbc-3448-4f43-a0dd-80c2fda322b8/ms_project_2013_download_64_bit_iso.pdfIn PDF document text
    • https://413f70bc-0247-4a04-a3fc-eabb14e2b93f.filesusr.com/ugd/f18ee6_455a9e0f3abf4d449423813cab71438a.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_off000116c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C2 5740 bytes
SHA-256: 834d5173b48e136dabfe30f6ab7182e885b4980bd4227f51a1f8baa6245ddd70
font_01_sfnt_off00012a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A31 10880 bytes
SHA-256: 8d36b1d7dd6facb556882aa576953ea5026a8076b4d28ec8ed3fe5dc54d61012