Malicious PDF — malware analysis report

Static analysis result for SHA-256 c51d978a3190a9e0…

MALICIOUS

PDF

42.8 KB Created: 2020-03-30 02:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2026-05-08
MD5: 374abbf4d4767b8e6d322714f37ca431 SHA-1: 851d82d3a21a4c7702975e887bc948c237ebbe9a SHA-256: c51d978a3190a9e08e697f6700072a5c13895c91f7b8dd508383bc6c7646d28e
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, a common tactic for SEO poisoning or phishing. The document body, while containing a title about human temperaments, is largely obfuscated and appears to serve as a lure. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. The primary intent appears to be directing users to a network of potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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 http://slaten-wedding.rominastiebenphotography.com/uploads/1/3/1/3/131398576/131398576.html#quais+os+tipos+de+temperamento+humano PDF link annotation
    • http://ume.bh/uploads/1/3/0/6/130604036/1486913.pdfIn PDF document text
    • http://susangay4rehoboth.com/uploads/1/3/0/6/130621781/202829.pdfIn PDF document text
    • http://shawnedwards.org/uploads/1/3/0/6/130620185/8967094.pdfIn PDF document text
    • http://yes4evr.com/uploads/1/3/0/6/130604326/jamoturume.pdfIn PDF document text
    • http://pwessays.com/uploads/1/3/0/5/130543106/1b8894f.pdfIn PDF document text
    • http://paradigmbehavioralhealth.net/uploads/1/3/0/6/130639242/jafuvavab.pdfIn PDF document text
    • http://checker-e.org/uploads/1/3/0/7/130775192/5533504.pdfIn PDF document text
    • http://otaracommunitylawcentre.com/uploads/1/3/0/8/130814229/bawiwujoti.pdfIn PDF document text
    • http://sauersfornorthglenn.com/uploads/1/3/1/4/131407012/sibozow_gexatumegepot_wujadiluw_wepilutu.pdfIn PDF document text
    • http://cristianonovelli.com/uploads/1/3/0/8/130814168/jojojub.pdfIn PDF document text
    • http://diamondkeyteam.com/uploads/1/3/0/8/130814717/dugefevaz_bipajam_kewamuduzalex_tinaxenasaref.pdfIn PDF document text
    • http://man7ubnih.net/uploads/1/3/0/7/130739488/dimusotafogurukeju.pdfIn PDF document text
    • http://helgaklecker.com/uploads/1/3/0/7/130739027/lisaraxo.pdfIn PDF document text
    • http://mail.westfordregency.com/uploads/1/3/0/3/130379506/wumagajenuralo-siduk-wopuxozewa.pdfIn PDF document text
    • http://amkarts.com/uploads/1/3/0/7/130776698/1213348.pdfIn PDF document text
    • http://cooksinheels.com/uploads/1/3/0/5/130543065/zelubiralodobasaru.pdfIn PDF document text
    • http://oldcalypso.com/uploads/1/3/0/7/130740196/nuriretepoke.pdfIn PDF document text
    • http://zypora.com/uploads/1/3/0/6/130639023/6054362.pdfIn PDF document text
    • http://ticked-box.com/uploads/1/3/0/7/130738790/jemofiledazodu.pdfIn PDF document text
    • http://nadjafeulner.com/uploads/1/3/0/5/130550775/figupomuzez.pdfIn PDF document text
    • http://infinityhealingcenter.com/uploads/1/3/0/2/130271143/rasamabatilowi.pdfIn PDF document text
    • http://webdisk.travrocks.com/uploads/1/3/1/4/131437599/3112695.pdfIn PDF document text
    • http://honeyloverfriend.com/uploads/1/3/0/4/130489226/jakad-xaberagijo.pdfIn PDF document text
    • http://prestigeloansigning.com/uploads/1/3/1/3/131380183/tazadebe.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
🗂 Part of campaign: alalson.info 5 samples

Related samples 5

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Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B43 9404 bytes
SHA-256: 0f190eb2b965245c126c33db9dde6edc4ec4c477a4da3a6be5f5c7091937c0e1

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