Malicious PDF — malware analysis report

Static analysis result for SHA-256 37b4a21f62fc7c9b…

MALICIOUS

PDF

41.0 KB Created: 2020-04-30 23:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 17ae179049e8245c11e88122adbd20bf SHA-1: 7c18a9f6adc8d4311c7bb1222a89fa9a30714891 SHA-256: 37b4a21f62fc7c9b7a80f7896f105c8ad937f45d16197fd674deb438fedf99ab
196 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, indicating a link farm strategy. The ClamAV detection and ML classifier strongly suggest malicious intent. The primary purpose appears to be directing users to a network of websites, likely for SEO manipulation or to host further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Dropper.Agent-8510543-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8510543-0
  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://stretchitout.org/uploads/1/3/1/3/131398598/131398598.html#advantages+of+a+spreadsheet+software PDF link annotation
    • http://riverplus-network.com/uploads/1/3/0/9/130969555/581c50c9619a2.pdfIn PDF document text
    • http://unitedawnings.com/uploads/1/3/0/7/130738622/mudabigiga.pdfIn PDF document text
    • http://laurenmagrisso.com/uploads/1/3/0/7/130738758/monitaxasukutan.pdfIn PDF document text
    • http://jayajitdas.org/uploads/1/3/0/2/130289690/8055734.pdfIn PDF document text
    • http://bastionhomes.com/uploads/1/3/0/2/130273789/gidomopot.pdfIn PDF document text
    • http://llamamiacustoms.com/uploads/1/3/0/6/130621856/0c6441230c685.pdfIn PDF document text
    • http://nashvilleaquaticdeliveryanddesign.com/uploads/1/3/0/5/130543155/wefewom_bumomesiwepa_vumisek.pdfIn PDF document text
    • http://glitzpageantsupplies.com/uploads/1/3/0/8/130815213/27582663.pdfIn PDF document text
    • http://salon85spa.com/uploads/1/3/0/6/130603836/809ab6e.pdfIn PDF document text
    • http://worstsuperpower.com/uploads/1/3/1/3/131381900/4b94b90fca.pdfIn PDF document text
    • http://mealsonwheelshazleton.org/uploads/1/3/0/6/130604067/3938456.pdfIn PDF document text
    • http://passionforthepack.org/uploads/1/3/0/2/130271078/abe6909ab66aba8.pdfIn PDF document text
    • http://nspiritcoaching.com/uploads/1/3/0/6/130620150/6228686.pdfIn PDF document text
    • http://youcansport.com/uploads/1/3/1/3/131382032/ravuva_ketexanimopinix.pdfIn PDF document text
    • http://kingwok.site/uploads/1/3/0/7/130738727/6922190.pdfIn PDF document text
    • http://tabetinternational.com/uploads/1/3/0/2/130288729/b4f05a3a.pdfIn PDF document text
    • http://leinsterlandscaping.com/uploads/1/3/0/4/130476619/solemipidum.pdfIn PDF document text
    • http://calisings.com/uploads/1/3/1/3/131384340/lunojawexoduvatesowu.pdfIn PDF document text
    • http://allanangelprinting.com/uploads/1/3/0/8/130814040/f7195.pdfIn PDF document text
    • http://mjconsultantsllc.net/uploads/1/3/1/4/131411245/4d0d426c15a77.pdfIn PDF document text
    • http://readingterminalmarket.shop/uploads/1/3/0/9/130969300/gokotikimokataxe.pdfIn PDF document text
    • http://sacramento-expungement.com/uploads/1/3/0/6/130604640/gusifegumaferele.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000079ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79BA 7524 bytes
SHA-256: 61a6e28b123e4ed0879607f9c81d70c94cee3118696a9172643cbaf75d0e2cab

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