Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a11d20ef9cfd0cd…

MALICIOUS

PDF

78.2 KB Created: 2021-03-15 00:22:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 678cb0bfe3d03b89df1d9b66815016d7 SHA-1: bfefcec80816616cbf7eb3711f9b2dc0893df1a8 SHA-256: 8a11d20ef9cfd0cda62ca19ecdb6fa8323022f31e9bd84501c0c9b72a534e080
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/award?keyword=hernia+inguinal+seram+pdf PDF link annotation
    • http://repaircreditscore.info/bejeweled_game_freetbi9g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475741/normal_5fce69860ed71.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450506/normal_5fc7735dd49f5.pdfIn PDF document text
    • http://gimemuwet.mypressonline.com/tijosezuvevuzu.pdfIn PDF document text
    • https://zebazowis.weebly.com/uploads/1/3/4/3/134310266/garufezekonize.pdfIn PDF document text
    • https://cdn.sqhk.co/zibomevuguli/gjmEmih/10130037352.pdfIn PDF document text
    • https://wiwanozamo.weebly.com/uploads/1/3/4/3/134306351/3424430.pdfIn PDF document text
    • https://cdn.sqhk.co/nadizolobe/jd5d7gg/checksur._exe_windows_7_32bit.pdfIn PDF document text
    • https://cdn.sqhk.co/bilexodofose/hhgiRhb/doxomibe.pdfIn PDF document text
    • https://bididanigatozum.weebly.com/uploads/1/3/4/3/134314142/kulolo-gosomoselutuxu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419235/normal_6000eedcca799.pdfIn PDF document text
    • https://cdn.sqhk.co/lisutovudaf/ggPXhbS/blended_taro_bubble_tea_recipe.pdfIn PDF document text
    • http://nasporte1.fun/red_ball_world_1_apkpd247.pdfIn PDF document text
    • http://lebuvowune.getenjoyment.net/xumokazisufi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0f8fedcd-12c0-4678-86f8-e2bff7269121.filesusr.com/ugd/70e7d4_8264d715adc54e86b1e652377121bfb2.pdf?index=trueIn PDF document text
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_a9c06277c56b4b4facbccbb09b8413c2.pdf?index=trueIn PDF document text
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_5cad6a947a4f456b8adacde8ccedfcd0.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_off0000f680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF680 5320 bytes
SHA-256: da801c60e7e4f8ed86ed75d33f6d37f8821667829559eb5b9d2fc679cb58ab5b
font_01_sfnt_off00010886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10886 10240 bytes
SHA-256: 3307aee570de206a9a7c0f45ba78d2bb45565d871609d2d40a90301eba45c889

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