Malicious PDF — malware analysis report

Static analysis result for SHA-256 670cf0e85f5d084c…

MALICIOUS

PDF

75.8 KB Created: 2021-02-11 13:04:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ccc63f751e6421ba00815e7e8f49a666 SHA-1: ffd54d6f83a19ae568a41f873f79e1fd01c99745 SHA-256: 670cf0e85f5d084ccb608470b92a632041400f88a0b80c5e2a7d45b3695b4fe2
252 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external PDF files hosted on disposable domains, indicating a link farm or SEO manipulation tactic. Several heuristics confirm the malicious nature, including a critical finding for a link to known malicious redirector infrastructure and a ClamAV detection as 'Pdf.Phishing.Trojan'. The ML classifier also strongly flagged this PDF as malicious. The document body is heavily obfuscated and unreadable, but the presence of a 'download' button lure suggests an attempt to trick the user into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crophysi.ru/aws?utm_term=videoder+14.+2.+2+mod+apk In PDF document text
    • http://reactivaperu-viabcpi.com/wuwosepobixomerxm8sp.pdfIn PDF document text
    • https://werotibumef.weebly.com/uploads/1/3/4/9/134900185/6cda2e11a512.pdfIn PDF document text
    • http://frasqen.online/63720332175q5f84.pdfIn PDF document text
    • https://bezesigut.weebly.com/uploads/1/3/2/6/132681157/18f8a765a966d46.pdfIn PDF document text
    • https://gileledera.weebly.com/uploads/1/3/0/8/130874536/6f9e6a5d4dfb5.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/SjgahhW/space_shooter_2020_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/segenapiza/jftgigg/zamazomi.pdfIn PDF document text
    • http://life-news.tech/agritourism_bookwvtlc.pdfIn PDF document text
    • https://zeposonuvijuz.weebly.com/uploads/1/3/4/7/134702940/gagojobuluvizav.pdfIn PDF document text
    • http://mainsale.info/encounters_in_avernus2ir17.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/hTjrYjc/41801858580.pdfIn PDF document text
    • https://cdn.sqhk.co/noviraxat/gLzBEFY/8671181359.pdfIn PDF document text
    • https://mopebewugo.weebly.com/uploads/1/3/0/7/130776026/gujerejenus_basemesonumi_gufibufexi.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/sisaxu/carrier_chiller_30xa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE336 5228 bytes
SHA-256: 5c5956917f64d27e041f49bf50fa6ee071221b903566259dc29c394b616f1582
font_01_sfnt_off0000f4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F1 2012 bytes
SHA-256: f29791c577fb8efd97a4133c5aa60f7028e8039184fbef8522f7a35ca0b46ea9
font_02_sfnt_off0000fe27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE27 10476 bytes
SHA-256: 08491f9f95e58d4934685f67dccea8ee508762834a45d4e5511b1c5dc22415c8

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