Malicious PDF — malware analysis report

Static analysis result for SHA-256 43950d9a48c87370…

MALICIOUS

PDF

68.0 KB Created: 2020-12-08 01:44:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 6c1a12b6d9395d4e1f4cc24e72200f43 SHA-1: 18c67cfa92bb261e89888ec0e28767f0a2fbd88c SHA-256: 43950d9a48c873704161248babd737974678cb35b24e2837f9d3702bdbf6499f
194 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many pointing to disposable hosting, suggesting it functions as a link farm. One of the primary URLs, 'https://trafftec.ru/123?utm_term=the+last+lecture+pdf+malayalam+translation', is associated with unknown reputation, indicating a potential phishing or malware distribution vector. The presence of urgency lures further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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
  • 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://trafftec.ru/123?utm_term=the+last+lecture+pdf+malayalam+translation PDF link annotation
    • https://duveniwapawas.weebly.com/uploads/1/3/4/2/134265961/walubejuda.pdfIn PDF document text
    • https://sifasoralut.weebly.com/uploads/1/3/4/4/134488674/4365224.pdfIn PDF document text
    • https://ginuwedisifixel.weebly.com/uploads/1/3/4/7/134744372/964ba5f0041.pdfIn PDF document text
    • https://xorusisu.weebly.com/uploads/1/3/4/3/134314808/japositetojazifosiv.pdfIn PDF document text
    • https://mawakigimewu.weebly.com/uploads/1/3/4/8/134875352/9267407.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc28f0617e7202640f4bff8/t/5fca366e9bc93d20d9b88554/1607087726760/my_piano_song_chords.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdc60263-7087-4722-b15d-ab08ae7b1bda/44705399573.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/st_clair_county_warrant_search.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e6b83dfdd95b60d5131d/t/5fc11b974e98326c023794a9/1606491036494/15221600174.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/bharathiar_university_category_b_phd_guide_list.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc56926a13a450bab12a87b/t/5fc9e1bd3ff94c207e0c046c/1607066046380/faxananafafenujitozabirex.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_off0000caa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA4 5444 bytes
SHA-256: f6449a54ffcffd08f5ee3cdc0b2425218721972134baaa630ffb368932d0f9a9
font_01_sfnt_off0000dd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD06 11420 bytes
SHA-256: ff62f5587e7fffb7e302e1ad98f4d72efc9cb6ebda055aa25d0b445e270ed896

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