Malicious PDF — malware analysis report

Static analysis result for SHA-256 d77730ccc5199419…

MALICIOUS

PDF

87.3 KB Created: 2021-03-14 07:24:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 89c17aa4a4789e4538ee57d0ad72f828 SHA-1: 02af441abcd2455665aa343c602c3aebf33e8134 SHA-256: d77730ccc51994196eda929f7d7155088004d1d3eaaf04f345ff2f3fe0812630
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 designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/123?utm_term=spanish+invitation+template+baby+shower PDF link annotation
    • https://cdn.sqhk.co/soxoxefumuv/i8hfACj/master_russian_word_of_the_day.pdfIn PDF document text
    • http://salonapp.xyz/76540016893xp6wo.pdfIn PDF document text
    • https://fuwurobo.weebly.com/uploads/1/3/0/8/130814642/zojasok.pdfIn PDF document text
    • https://cdn.sqhk.co/sofizagumup/gPjiict/safibofafus.pdfIn PDF document text
    • https://cdn.sqhk.co/lejesapazud/ij7jj1I/79733834467.pdfIn PDF document text
    • https://tegugozitofo.weebly.com/uploads/1/3/0/8/130874592/233336.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxeromewime/Ljat9gf/numolafopul.pdfIn PDF document text
    • http://bluebadge-support.com/babavetevegunumogas91695.pdfIn PDF document text
    • https://wafulezejo.weebly.com/uploads/1/3/4/7/134748518/kapeketi.pdfIn PDF document text
    • https://ligelonajoka.weebly.com/uploads/1/3/1/4/131407163/mezetuminodoru-loluvup.pdfIn PDF document text
    • https://safamitiwifiro.weebly.com/uploads/1/3/0/7/130739579/saxevonemekala.pdfIn PDF document text
    • http://domainlimax.xyz/which_is_not_a_conflict_resolution_skillsmj8zb.pdfIn PDF document text
    • https://cdn.sqhk.co/rawerusiwala/hgidBSk/vexivogano.pdfIn PDF document text
    • https://nudegono.weebly.com/uploads/1/3/4/6/134682657/daxabutavawozuzafa.pdfIn PDF document text
    • https://guxadudupis.weebly.com/uploads/1/3/4/7/134751999/5475919.pdfIn PDF document text
    • https://cdn.sqhk.co/gewanunu/ieURiby/zombies_2_dolls_uk_zed.pdfIn PDF document text
    • https://cdn.sqhk.co/nugizape/nNsgfho/word_tower_crossword.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xitemefunugege.epizy.com/nvidia_shield_android_tv_2015_vs_2017.pdfIn PDF document text
    • http://sijozorugepidu.epizy.com/linkedin_recommendation_for_boss_template.pdfIn PDF document text
    • http://fadojogepu.epizy.com/2020_calendar_printable_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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D2 5556 bytes
SHA-256: 24f74c71bee29e1fd98fc564b09b56a998db8fd23c57394884dcdb71dd780ff7
font_01_sfnt_off00012ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA2 10960 bytes
SHA-256: 3662b7ccfef5645a2f69b81e80a943f67cbc9d449888fa83abde135a6d3d671b

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