Malicious PDF — malware analysis report

Static analysis result for SHA-256 52c3b37348033fe1…

MALICIOUS

PDF

75.9 KB Created: 2021-03-30 18:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 01d7a7b36acf647122c434c2ff1649c3 SHA-1: 474c3a8c9903c159ac67ed6acfd285a702db0d40 SHA-256: 52c3b37348033fe10377b8d949fdacedd1e13a00ea200ecfbe966b3667d07860
194 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It contains a link farm with numerous external URLs hosted on disposable domains, designed to redirect users to potentially malicious content. The presence of a 'download button' heuristic further suggests a deceptive workflow aimed at tricking users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fokemale.ru/123?utm_term=telugu+dj+audio+songs+2019 PDF link annotation
    • http://gexomafe.mypressonline.com/68909234920.pdfIn PDF document text
    • http://boost-shop.xyz/what_is_long_run_productionle9ew.pdfIn PDF document text
    • https://kagilovudugavap.weebly.com/uploads/1/3/1/1/131164538/54476.pdfIn PDF document text
    • http://kidiwutimako.mygamesonline.org/77077949483.pdfIn PDF document text
    • https://dusivasawomila.weebly.com/uploads/1/3/4/6/134660852/xutoxigazeparu.pdfIn PDF document text
    • https://nererudufujodu.weebly.com/uploads/1/3/4/3/134321338/96e5a57.pdfIn PDF document text
    • https://funapimezu.weebly.com/uploads/1/3/1/0/131070883/vejizup.pdfIn PDF document text
    • http://vetovikaxu.mypressonline.com/sarise.pdfIn PDF document text
    • http://parkji5x.xyz/tekin_rs_gen_3_manual9150d.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/wogikokuzotaxa/t4_smd_diode_datasheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43145353-3dd0-402b-80de-3b0e442d6a94/42562869374.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b0c4a17-6b8d-4ec6-a177-0dc4da1ca371/how_to_change_oil_on_miller_bobcat_250.pdfIn PDF document text
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_343eafe7cab743b6a163442d5bbed1c3.pdf?index=trueIn PDF document text
    • https://ad323f3e-245e-4e3c-8b16-de91fefec063.filesusr.com/ugd/5ea691_8160d288e4a745d68b20be3ba41539cf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dezajok/72344367364.pdfIn PDF document text
    • http://tivakifuzir.atwebpages.com/kidekamo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/845a7a2b-10ea-4e03-a5ba-f723ee2c9679/82015260247.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_off0000e9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A8 5404 bytes
SHA-256: 7095471fe24978284326955e0a4194730ac43243abac670318e58910d61b2ea8
font_01_sfnt_off0000fc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC22 11372 bytes
SHA-256: 67ea4cfe1f37c825a94fca6f869fe500d9152f23ef7e694c9b25f62854d1e3c0

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