Malicious PDF — malware analysis report

Static analysis result for SHA-256 b51b82ac40d0dd60…

MALICIOUS

PDF

89.5 KB Created: 2021-01-24 23:40:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: de555c72190ad1fc140d28b25c1556ea SHA-1: 4238522d5e9b232e19608acef025e2a48eba274f SHA-256: b51b82ac40d0dd60a31bf0b33a394efbf9707fe19dcc63250daf82a10498c33e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to leverage external resources for malicious purposes.

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://traffnew.ru/123?utm_term=intro+to+formal+languages+%2526+automata+5th+pdf PDF link annotation
    • https://gegoviboz.weebly.com/uploads/1/3/4/8/134876631/74c81a7665f63.pdfIn PDF document text
    • https://dixufewopirar.weebly.com/uploads/1/3/0/7/130775961/a181d037.pdfIn PDF document text
    • http://datingdate.site/71687051956anfih.pdfIn PDF document text
    • https://nafuxiba.weebly.com/uploads/1/3/4/0/134097784/6990937.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470521/normal_5fd812f27dc22.pdfIn PDF document text
    • https://wezalowesugalu.weebly.com/uploads/1/3/2/8/132815960/gapobufizanokukel.pdfIn PDF document text
    • http://thedefenseforge.com/wallpaper_cute_teddy_bear_pinkapekz.pdfIn PDF document text
    • https://migixemigesafo.weebly.com/uploads/1/3/1/3/131381985/ziwukipuvatuzor.pdfIn PDF document text
    • https://sagakoto.weebly.com/uploads/1/3/0/8/130814189/402312.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457302/normal_5fcd3551c44d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409246/normal_5fd8d2c114275.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385216/normal_5fec63e0c3191.pdfIn PDF document text
    • https://wosumugip.weebly.com/uploads/1/3/4/8/134867897/ravojodag-digositokafi-nuduwo.pdfIn PDF document text
    • http://frukt.fun/hello_neighbor_ps4_act_1_guideqg5sr.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
    • 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_off00010521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10521 5024 bytes
SHA-256: b52bfbae9aa57a2669f6f6c785eac1806a29447c7c4cf75e6aa545055b60dff2
font_01_sfnt_off0001161d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161D 12392 bytes
SHA-256: d9e56b8ef30cad53a7875c7ef259e721ff20e3f6f7dde240829edbfeeef563fb
font_02_sfnt_off00014038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14038 17020 bytes
SHA-256: a100db39335ad82aa4a48e794614622f8d79d594a3fa2ed0e169d9611d8f234f

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