Malicious PDF — malware analysis report

Static analysis result for SHA-256 da3c7a13fd91267b…

MALICIOUS

PDF

117.7 KB Created: 2021-01-18 16:00:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 543c9d28428d3acf6755965fdddd5134 SHA-1: 9d8ed8cf6a48d5d9a99c916593f810bd0b271675 SHA-256: da3c7a13fd91267b217cf5b3f964ba989bfd65fcd8de2e94bf248c250365fe32
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs and the nature of the link farm point towards an attempt to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=robert+nozick+anarchy+state+and+utopia+pdf PDF link annotation
    • https://xuvakaxatal.weebly.com/uploads/1/3/1/0/131070170/4102074.pdfIn PDF document text
    • https://cdn.sqhk.co/xadowififux/jhzTHAn/local_bars_in_las_vegas_with_live_music.pdfIn PDF document text
    • https://site-1168056.mozfiles.com/files/1168056/44843696155.pdfIn PDF document text
    • https://nokemodikobo.weebly.com/uploads/1/3/4/3/134308311/xuzere_soxobejone.pdfIn PDF document text
    • https://cdn.sqhk.co/foseziwate/ghMhj0u/54518163446.pdfIn PDF document text
    • https://cdn.sqhk.co/pevejotomoma/BM3hahi/velalibuwibulam.pdfIn PDF document text
    • https://ramokazadi.weebly.com/uploads/1/3/4/4/134470245/4f4f489ad495.pdfIn PDF document text
    • https://site-1166680.mozfiles.com/files/1166680/58659145547.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/djgzgjc/ramadawugereje.pdfIn PDF document text
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/sesakaf.pdfIn PDF document text
    • https://site-1173313.mozfiles.com/files/1173313/traxxas_link_app_update.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/sefepugolupalax/sentencing_guidelines_assault_abh.pdfIn PDF document text
    • https://s3.amazonaws.com/wutisigila/99807459777.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/get_your_guide_prague_segway.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/pabavabirenudotesu.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17617 5576 bytes
SHA-256: d1604453f722222bc80115dcee9f462fe9559eb189dfc788b5493e4fe1611d91
font_01_sfnt_off0001891f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1891F 13012 bytes
SHA-256: ac0b09837bc9ec158457541e4604cff0ce06688f140341fed2a40807609a84bf
font_02_sfnt_off0001b4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4B0 16060 bytes
SHA-256: c43c81af3addadc619f1b50b0eb79006c69e58cb90abf43f7a5fbd940e22698c

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