Malicious PDF — malware analysis report

Static analysis result for SHA-256 c797e18d31e219c1…

MALICIOUS

PDF

70.5 KB Created: 2021-02-18 00:16:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 55cfefd2fbe5e2b96b4cd392c8831168 SHA-1: fb6277c8d4225ac2b30084c8b43e54ea5490ac7c SHA-256: c797e18d31e219c17ad478cce286fcf7f31b46f2b2cf743c3aa1fc16f731ca49
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/123?utm_term=coleman+maax+spa+parts PDF link annotation
    • http://japebevavagufip.22web.org/79001687086.pdfIn PDF document text
    • https://raputaluwim.weebly.com/uploads/1/3/1/6/131606275/gijekene.pdfIn PDF document text
    • https://kuserivexujeza.weebly.com/uploads/1/3/4/3/134331384/rokerowewodafek.pdfIn PDF document text
    • http://vodabezoli.iblogger.org/video_bts_dna_live.pdfIn PDF document text
    • https://zogadinarele.weebly.com/uploads/1/3/1/4/131409244/4be25141d62.pdfIn PDF document text
    • https://rowopubogapog.weebly.com/uploads/1/3/4/2/134234702/8a0e9da5.pdfIn PDF document text
    • https://xekixaxaleza.weebly.com/uploads/1/3/2/6/132695200/fd105dfa651db7a.pdfIn PDF document text
    • https://nopubogap.weebly.com/uploads/1/3/4/6/134667077/4531c1f90d.pdfIn PDF document text
    • https://xuzimelo.weebly.com/uploads/1/3/4/1/134132070/jugufijubusofesim.pdfIn PDF document text
    • https://jumirusuvowelu.weebly.com/uploads/1/3/4/6/134632856/7270f4.pdfIn PDF document text
    • http://vobonenagixavus.66ghz.com/affinity_photo_1._5_windows.pdfIn PDF document text
    • http://joy-todays.online/clculo_diferencial_e_integral_2_exerccios_resolvidos7s4iw.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/rubidokezive/a_level_maths_questions_by_topic.pdfIn PDF document text
    • http://jomedive.epizy.com/91777852724.pdfIn PDF document text
    • http://liwituro.epizy.com/sesotho_bible_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/75526286461.pdfIn PDF document text
    • https://s3.amazonaws.com/musokejixami/48027473442.pdfIn PDF document text
    • http://pukevekoba.rf.gd/retirement_planning_worksheet_free.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84C 4940 bytes
SHA-256: 5e5a48d48da76f301676465f34827f3c26f1f3a0996fb54fff112c8dbbe71624
font_01_sfnt_off0000e8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F9 10488 bytes
SHA-256: 5bad63a38c083d9ecafe646c7533b4f881d57b34788343dd02611f4657386e83

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