Malicious PDF — malware analysis report

Static analysis result for SHA-256 b83bd5a1f8db91cb…

MALICIOUS

PDF

69.4 KB Created: 2021-02-23 20:34:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 764fc3b7ab87913f3e88fb83aebc2d6f SHA-1: 2f27b9681c65f128a95264772e952708e3635258 SHA-256: b83bd5a1f8db91cb30f5fe0a89bf483fe972f949d0e0549c425fb1656ed24208
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDF files, indicative of a link farm or SEO spamming technique. The primary URL, https://seumenha.ru/strik?utm_term=buku+plato+timaeus+and+critias+pdf, is likely used for phishing or to distribute further malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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 https://seumenha.ru/strik?utm_term=buku+plato+timaeus+and+critias+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415321/normal_603234c30c378.pdfIn PDF document text
    • https://xunopigiwigon.weebly.com/uploads/1/3/1/6/131636761/xetubafe_wipafuzad_jejagifavetux_tobalavato.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365545/normal_603045a122066.pdfIn PDF document text
    • https://fukimeremunosav.weebly.com/uploads/1/3/1/3/131379236/sedanoke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475215/normal_60332784247d9.pdfIn PDF document text
    • https://poliradu.weebly.com/uploads/1/3/5/9/135991332/2445944.pdfIn PDF document text
    • https://revowerixes.weebly.com/uploads/1/3/1/6/131607662/gekizanamubu-ribosibi-poxarolegu.pdfIn PDF document text
    • https://sutovuwoti.weebly.com/uploads/1/3/0/9/130968995/kulaniju.pdfIn PDF document text
    • http://lenudes.com/fourier_law_of_heat_conduction8wnmg.pdfIn PDF document text
    • https://volokosebu.weebly.com/uploads/1/3/4/8/134871595/8905814.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462736/normal_5fcc0243bbe8f.pdfIn PDF document text
    • http://repair-kvadrokopterov.ru/sanyo_eneloop_hr-_3utgb_datasheetyycyu.pdfIn PDF document text
    • http://creampiepow.club/bhojpuri_film_linkc5p5b.pdfIn PDF document text
    • http://geniusenglish.space/badozowiriwitokirokewaff1eip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483851/normal_5fcd37f571abc.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/kitakilesa/84148514696.pdfIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/nadipi.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/kali_linux_android_hack_link.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/27684697930.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/80242137103.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/fajukikogawe.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/fafukawizimuketosozabi.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/mojorufutokures.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_off0000cfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBB 5416 bytes
SHA-256: 33e6d6f8ba428c33bfdb2a239ce313263ddb5ede8f255e0fd242f7c5c778593a
font_01_sfnt_off0000e215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE215 10696 bytes
SHA-256: 3c9ef7a536b0a7d5bcd220f8173f8241fbf46b1331d32e8593e8500b9dbee551

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