Malicious PDF — malware analysis report

Static analysis result for SHA-256 87eccc5630a2dc5c…

MALICIOUS

PDF

76.7 KB Created: 2021-02-10 15:55:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 0430dcdef2b6e86694378980ca32f86b SHA-1: 7d0e106b39dfe3b69f21b60573781a0ad0b1ea4e SHA-256: 87eccc5630a2dc5cfddf55d535511ea7f9914cfd26f6ef5a15ab2b8ef06b6a60
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or redirection scheme. One URL, 'https://jottigo.ru/123?utm_term=womens+flip+flops+with+bottle+opener+on+bottom', is presented in a way that suggests a lure, possibly related to e-commerce, to entice users to click through to a malicious site. No scripts were extracted, but the presence of multiple suspicious URLs points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jottigo.ru/123?utm_term=womens+flip+flops+with+bottle+opener+on+bottom PDF link annotation
    • http://healthit.space/11225359070pg8yj.pdfIn PDF document text
    • http://winclean-shop.space/298477782rhzut.pdfIn PDF document text
    • http://mjawebdesign.net/fofufafivavexzmdz.pdfIn PDF document text
    • http://hhizmet.com/xakigurumetiwowomoksomz.pdfIn PDF document text
    • https://cdn.sqhk.co/zodavujera/gjjhOhY/simobe.pdfIn PDF document text
    • http://omynutural.space/69538340901bvoci.pdfIn PDF document text
    • http://swiss-family.space/life_cycle_of_anthocerosbk4pr.pdfIn PDF document text
    • http://kwini-fini.online/paramazositrw4bn.pdfIn PDF document text
    • http://livethailand.fun/katetoronixefebog69mw.pdfIn PDF document text
    • https://cdn.sqhk.co/ratosakip/dFzoifm/chikki_recipe_dry_fruit.pdfIn PDF document text
    • http://silkhfig.bid/felasojx93mc.pdfIn PDF document text
    • http://fimewot.xyz/nijaxakiguxezxgs87.pdfIn PDF document text
    • https://cdn.sqhk.co/vapezuwe/uhiRjgt/ropoje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000eb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6D 5176 bytes
SHA-256: 8281dae70d6c6d13f7c1dbae3d05dafe7306a5024e8bff1b9bbbdddfa917bc63
font_01_sfnt_off0000fcf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF1 12400 bytes
SHA-256: 1a69458427da8556d8b5d0f0c8629a5e232bd236a22ddd186b126846a10e26d8

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