Malicious PDF — malware analysis report

Static analysis result for SHA-256 adc31aeda15fc3d3…

MALICIOUS

PDF

72.9 KB Created: 2020-12-15 04:52:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 88de763446f1963b03f11062dc6f75e5 SHA-1: 10ea2da9dc389735f39f31b8801203b1da884a3a SHA-256: adc31aeda15fc3d3a4accc99b6b6cab5d02ce2a52c0fc9de3c4619e5f056c9cd
252 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffmen.ru/123?utm_term=roku+private+listening+stutter In PDF document text
    • https://weduzoviduluwiz.weebly.com/uploads/1/3/4/3/134385862/vakisibu_gimugirepaviji_fijadosel_jijex.pdfIn PDF document text
    • https://taxajefikudo.weebly.com/uploads/1/3/4/7/134765143/lokore.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380068/normal_5fcf24b887839.pdfIn PDF document text
    • https://xurizuful.weebly.com/uploads/1/3/4/8/134898541/9907a3b7c1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393035/normal_5fc3010062767.pdfIn PDF document text
    • https://funegetoxa.weebly.com/uploads/1/3/4/7/134742159/mideletike_kovawaboni.pdfIn PDF document text
    • https://redodire.weebly.com/uploads/1/3/1/4/131408340/8096639.pdfIn PDF document text
    • https://satufimitu.weebly.com/uploads/1/3/4/7/134715308/eb134affdd.pdfIn PDF document text
    • https://susokeruno.weebly.com/uploads/1/3/4/6/134656617/xivepodapatuv.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
    • https://static1.squarespace.com/static/5fced41fd131352a6a8a585e/t/5fd627515b1f6f7539cfd841/1607870290834/31315201662.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c477dd5-070b-485f-9df9-15743d85a00a/interpretive_biography_denzin.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0fbb61c8c741314323605/t/5fc158ebeaf37e3b64ce6448/1606506735288/soul_eater_kilik_episodes.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_off0000d157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD157 5000 bytes
SHA-256: 5b3d298729077065a799f3497424b1099f08ccd5069acc17261c2c58029bd46d
font_01_sfnt_off0000e276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE276 10780 bytes
SHA-256: 54e113fb27f2af4da30d26f3de6bad2cd246d47ab4828800584e6a8622226d0c
font_02_sfnt_off0001075c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075C 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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