Malicious PDF — malware analysis report

Static analysis result for SHA-256 61bb189d7f435791…

MALICIOUS

PDF

70.0 KB Created: 2021-06-11 08:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5aac2f0c632674bd918db0f6ba71bf6 SHA-1: 65efc38825e47e4a32e4fe02a2c3b1682b408244 SHA-256: 61bb189d7f435791e6c58511362543fdab49a5592be7ed66217592336790afc1
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to other PDFs, suggesting a link farm or redirection mechanism for malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates a common tactic to bypass security scanners by instructing the user to download an archive and use a provided password. While no scripts were directly extracted, the PDF structure and extensive external linking are indicative of malicious intent, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pistant.ru/pbw?utm_term=chak+de+india+full+movie+download+bolly4u
    • https://rabavuvorek.weebly.com/uploads/1/3/1/0/131070866/89e6bb856279.pdf
    • https://static.s123-cdn-static.com/uploads/4485714/normal_5fe1e9a3f3e96.pdf
    • https://static.s123-cdn-static.com/uploads/4415537/normal_5fc98fa89a323.pdf
    • https://static.s123-cdn-static.com/uploads/4412582/normal_60052a518f577.pdf
    • https://cdn-cms.f-static.net/uploads/4404528/normal_60bb8022b47b7.pdf
    • https://static.s123-cdn-static.com/uploads/4380223/normal_5fee96142086c.pdf
    • https://cdn-cms.f-static.net/uploads/4458827/normal_601f5efa7cbca.pdf
    • https://mapimodedafibo.weebly.com/uploads/1/3/4/7/134708703/zeduxafete.pdf
    • https://static.s123-cdn-static-d.com/uploads/4420030/normal_60b4a1cf071ff.pdf
    • https://firikanafumofud.weebly.com/uploads/1/3/0/9/130969048/93694762a.pdf
    • https://cdn-cms.f-static.net/uploads/4492281/normal_60396f11eef12.pdf
    • https://static.s123-cdn-static-d.com/uploads/4415077/normal_60affa4db762c.pdf
    • https://static.s123-cdn-static.com/uploads/4448984/normal_60089b5bac842.pdf
    • https://nozezezolakufu.weebly.com/uploads/1/3/2/6/132695232/pigizedidapewo.pdf
    • https://terekutididir.weebly.com/uploads/1/3/0/9/130969195/tomepagotubasel.pdf
    • https://cdn-cms.f-static.net/uploads/4476294/normal_5fdb2a6078106.pdf
    • https://cdn-cms.f-static.net/uploads/4410722/normal_6056466873ee1.pdf
    • https://cdn-cms.f-static.net/uploads/4381098/normal_5fdb3540b3208.pdf
    • https://wipabobape.weebly.com/uploads/1/3/5/9/135985954/kapuwalibo_puturat.pdf
    • https://rarejitidod.weebly.com/uploads/1/3/5/9/135993923/a0e87e16666d90.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fixiguru.pbworks.com/f/animated_wedding_invitation_templates_free_download.pdf
    • http://wurutaw.pbworks.com/w/file/fetch/144555867/11691356145.pdf
    • http://giwupiraride.pbworks.com/f/xavimifam.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d463.bin
e815b2e20f46e9b7676339a848151471a07230fb5c6593d22a513d2347c42cc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD463 5324 bytes
font_01_sfnt_off0000e679.bin
cfc5b653c9efe3e45e816bde4d4a353e71c43f322d73b8549f14e3494b14681c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE679 10148 bytes

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