Malicious PDF — malware analysis report

Static analysis result for SHA-256 c231708303b3cbb7…

MALICIOUS

PDF

100.0 KB Created: 2021-04-05 14:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 49e9d51206cf84c67f88ba1abe76d05c SHA-1: 7c84470b5b20383b8b2fc767df05faa07f5bfcc3 SHA-256: c231708303b3cbb78e8b14d0535e542307bebab17158e4a5763b1d1da6fce8a0
244 Risk Score

Malware Insights

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

This PDF document was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged for containing a link farm and redirecting to known malicious infrastructure. The embedded URLs suggest a phishing or scam attempt, likely designed to lure users to malicious sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://yafferge.ru/strik?utm_term=bible+trivia+questions+multiple+choice In PDF document text
    • https://vudiwajexisipu.weebly.com/uploads/1/3/4/0/134096418/6505369.pdfIn PDF document text
    • https://cdn.sqhk.co/turanexode/Lhgifib/father_and_son_presidents.pdfIn PDF document text
    • https://gulekikafosevog.weebly.com/uploads/1/3/2/3/132303175/249653.pdfIn PDF document text
    • https://cdn.sqhk.co/dogutadova/qieaAcw/29790310613.pdfIn PDF document text
    • https://ripukalogud.weebly.com/uploads/1/3/4/3/134391837/petixixepivusagi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404964/normal_5ff1309b2dd8d.pdfIn PDF document text
    • https://cdn.sqhk.co/xubafofin/CGohhjf/linear_regression_in_r.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/2fjdugc/candomble_religion.pdfIn PDF document text
    • https://bulasenojagaroj.weebly.com/uploads/1/3/4/3/134357248/77be228424a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475875/normal_5ff32919dc79f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505699/normal_602317b28e22d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379379/normal_5fdb6df5c51c1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4fe405c-418f-4451-ba48-7e4fecf1d808/11965491229.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4eb9933b-78b7-46af-be5b-3bf1010896bb/burger_king_nutrition_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/22758883624.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/94907136389.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5be86fd2-1a80-448d-a154-678fa487dcb0/kevefaratibu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afa437be-078e-4195-b232-08886e87815f/restaurant_financial_model_excel_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c5b5494-05c0-4cef-9241-12014f9861df/how_much_are_speed_queen_top_load_washers.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_off0001470d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1470D 5548 bytes
SHA-256: cdacc6741c2d55b5a87322485d90ef044636bbc9d944903db8ef635ff2894ed8
font_01_sfnt_off000159cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159CB 12112 bytes
SHA-256: 994fa2e1952b9a9ba3bcf127d275fa7489cd5d30cd9200c7d1d131b13085e05c