Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a06cff170a1952…

MALICIOUS

PDF

73.0 KB Created: 2021-02-16 10:40:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: ae1f3686e035554c498d2ae3202b9871 SHA-1: 3054fb6fc7f26df18678df25d52c2404c28642c1 SHA-256: b3a06cff170a19523d1f41fa8e0f4a8cc881f6129ae10dd97014e7d51592623a
244 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by multiple heuristics and a machine learning classifier. It functions as a link farm, containing numerous embedded URLs pointing to other PDF files hosted on various domains, many of which appear to be disposable or associated with link farms. The primary heuristic firings indicate the PDF links to malicious redirector infrastructure and is part of a link farm on disposable hosting. This suggests the document's purpose is to manipulate search engine results or distribute further malicious content.

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
  • 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://crophysi.ru/strik?utm_term=the+silver+chair+chapter+14+summary In PDF document text
    • https://kelonefak.weebly.com/uploads/1/3/2/6/132683111/05b72d.pdfIn PDF document text
    • https://cdn.sqhk.co/forexidof/jWibZFL/79322509488.pdfIn PDF document text
    • http://classkaod.ru/tabonevezoct1ad.pdfIn PDF document text
    • https://cdn.sqhk.co/mofosalamo/E9gchgL/lobby_hobby_stores.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418570/normal_5fda355a28b5d.pdfIn PDF document text
    • https://fomunova.weebly.com/uploads/1/3/4/6/134684458/jojixigo.pdfIn PDF document text
    • https://cdn.sqhk.co/navififoro/PjdH58D/callaway_golf_shoes_spikeless.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvinudubuno/ibgfijg/verizon_wireless_customer_service_pay_my_bill.pdfIn PDF document text
    • https://lupudeme.weebly.com/uploads/1/3/1/3/131378919/43ab8.pdfIn PDF document text
    • https://todijaxazifaro.weebly.com/uploads/1/3/4/3/134342800/dovevapumavodoko.pdfIn PDF document text
    • https://cdn.sqhk.co/wazilisiko/ecSx6ES/15043826777.pdfIn PDF document text
    • https://cdn.sqhk.co/susojareb/ligjjg9/wiwajuzabogolar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369920/normal_60081aeab310a.pdfIn PDF document text
    • https://cdn.sqhk.co/zifuvifiweva/jjxtidK/train_times_newcastle_to_sydney_saturday.pdfIn PDF document text
    • https://ruxebawinafa.weebly.com/uploads/1/3/0/7/130776533/ae50a.pdfIn PDF document text
    • https://xibagepop.weebly.com/uploads/1/3/1/4/131438114/6715c8c.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE122 5424 bytes
SHA-256: 335fce3d8a1e09de41bd9ad2669c9f48ece6ed9e85e70a60c1313ef4d62872ce
font_01_sfnt_off0000f381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF381 10520 bytes
SHA-256: 7e457a2ef68eb82ab40427d5036f95617b50e41d17f8939326ef0f99f721ba3b

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