Malicious PDF — malware analysis report

Static analysis result for SHA-256 751632c0c3d4c92d…

MALICIOUS

PDF

88.0 KB Created: 2021-03-10 04:48:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 33070fe62b3c31525174e8d7f999b745 SHA-1: 137ba05cf9b43732985cb95a54c36ce65d4e0ac3 SHA-256: 751632c0c3d4c92d467e71d7587a6ed87ca5bdd41fafbc29397908b3113fc3f8
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of external links, forming a link farm, with one prominent URL pointing to a firmware download page. This suggests a phishing or scam attempt to trick users into downloading potentially malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jumiwimov.ru/strik?utm_term=wrt3200acm+dd-wrt+firmware+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4499635/normal_6025b5f099396.pdfIn PDF document text
    • https://cdn.sqhk.co/nodezaneripe/dBohaih/adobe_premiere_rush_video_editing_app_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413113/normal_5fc9036a3f538.pdfIn PDF document text
    • https://cdn.sqhk.co/gadewekunel/dthhjbv/conquest_force_meaning_in_urdu.pdfIn PDF document text
    • https://jokiwaxe.weebly.com/uploads/1/3/2/7/132740814/9882798.pdfIn PDF document text
    • https://cdn.sqhk.co/lajawawinu/ierjjxU/hockey_mask_halloween_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/wawabosamugo/Oics4sT/86306410495.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376879/normal_602a0f5c9d549.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486201/normal_6000d4b8d920c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378175/normal_5fefb4dc456d5.pdfIn PDF document text
    • https://dapodufez.weebly.com/uploads/1/3/3/9/133997146/rifojumeni.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458388/normal_5fff792fa0e6d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374178/normal_5ff585396fe11.pdfIn PDF document text
    • https://cdn.sqhk.co/doporaba/eINaFje/receita_de_glace_simples_para_confeitar_bolo.pdfIn PDF document text
    • https://cdn.sqhk.co/buwaxaxodi/iic77Ov/mega_lovania_sans_meme_sound_buttons.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506131/normal_60470133d1e93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482623/normal_6012e37da494b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451375/normal_601316037d2ab.pdfIn PDF document text
    • https://kafunonedejo.weebly.com/uploads/1/3/4/6/134662894/tabur_xolugizexufa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456393/normal_5fe9b63c1563a.pdfIn PDF document text
    • https://cdn.sqhk.co/pejasibupap/icjaQhb/30731230747.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444115/normal_601216899f721.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A18 5352 bytes
SHA-256: 5bf659afe27333ee4818ff8012d3fe39c397d34e5a51c6845c90bce0a5fbc3d3
font_01_sfnt_off00011c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C46 11892 bytes
SHA-256: 7588157ad1ec48385b960e5a667deb8184975efc060406e531ecaf372abefdaa
font_02_sfnt_off000144b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144B1 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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