Malicious PDF — malware analysis report

Static analysis result for SHA-256 82823f33430fed1c…

MALICIOUS

PDF

85.4 KB Created: 2021-03-13 17:13:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0fdd2521075b0b845ceca85e60ae61f4 SHA-1: 8c4c01870d26d08ae6f300761ce6be3a9b06f6b2 SHA-256: 82823f33430fed1cf2a2ed869327bcf4fe1546abd5f4210dea6db2db905470f0
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 0.9958

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://crophysi.ru/wix?keyword=best+sift+test+study+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371269/normal_5fd1308d8bd69.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387226/normal_5fc8f1fda035d.pdfIn PDF document text
    • https://fazolusafiwef.weebly.com/uploads/1/3/4/5/134585025/wanavorabufete.pdfIn PDF document text
    • https://nimewoguvinu.weebly.com/uploads/1/3/4/4/134433183/dc5651c7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453142/normal_5fe874e1b0e73.pdfIn PDF document text
    • http://table-wait.com/gixitozakupekizet6mujf.pdfIn PDF document text
    • http://instasurprise.online/school_days_love_story_telugu_movie2yf9h.pdfIn PDF document text
    • http://damvglaz0.xyz/login_activity_android_templatewdwbh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480595/normal_5ff4a7dcc461d.pdfIn PDF document text
    • https://cdn.sqhk.co/fezifoxunif/jgggdx3/ultimate_motorcycle_simulator_mod_free_download.pdfIn PDF document text
    • http://raifaisentapp.online/glitch_wallpaper_hdle33y.pdfIn PDF document text
    • https://cdn.sqhk.co/nupozifulija/LSw8hew/tribal_seeds_vampire_lyrics.pdfIn PDF document text
    • http://hdvideo.design/34137486376nn5wv.pdfIn PDF document text
    • https://liloxowilobo.weebly.com/uploads/1/3/4/2/134265539/c269e74d209.pdfIn PDF document text
    • https://cdn.sqhk.co/sononipo/ehfghjb/gilogalipelupa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416501/normal_601563cca7386.pdfIn PDF document text
    • http://imedo.ru/katemalawikuvijedexogugkp6og.pdfIn PDF document text
    • https://xomupufemi.weebly.com/uploads/1/3/4/3/134322732/b5b184.pdfIn PDF document text
    • http://instapriz24.site/10379104340a5407.pdfIn PDF document text
    • http://deine-gabe.com/carol_of_the_bells_ttbbhstzy.pdfIn PDF document text
    • http://allerop.xyz/unravel_me_sabrina_claudio_letrauvvm8.pdfIn PDF document text
    • https://bumobuzeki.weebly.com/uploads/1/3/4/4/134477779/5299826.pdfIn PDF document text
    • http://natnat.fun/xipufifesud10vx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_07269d9f9abc42e5a137af191238b721.pdf?index=trueIn PDF document text
    • https://41fe7446-7195-45c8-906d-de5e784989f9.filesusr.com/ugd/e02969_9c1bebec18a04f24a9a36027340face0.pdf?index=trueIn PDF document text
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_95cf0a7f7c58432690513eec5a099577.pdf?index=trueIn PDF document text
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_286f1d12487a4eaf87efcf2188b58077.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_off00011038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11038 4888 bytes
SHA-256: 2233277e982bfd2b794817df837a6ebc3b7ca122db5ba9dc801e57a0b63d2f31
font_01_sfnt_off00012104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12104 10948 bytes
SHA-256: 6874fd3ac2a71506f7344a301b6095feba155a6f9405091fed5679ebb05f575f