Malicious PDF — malware analysis report

Static analysis result for SHA-256 a728ec0327497af8…

MALICIOUS

PDF

72.6 KB Created: 2021-06-07 16:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2e7ea53099f173f40c26c52aeffa99c9 SHA-1: 204da56635beef349bcb489d629176737bbda07b SHA-256: a728ec0327497af8bb685a63082bcd81d29fb4a5b916501981408aa0e75b702d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document body, though partially corrupted, contains text suggesting a lure related to 'Call of the wild discussion questions and answers', directing users to external URLs. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate an attempt to redirect users to potentially malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://chcial.ru/pbw?utm_term=call+of+the+wild+discussion+questions+and+answers PDF link annotation
    • https://falopizesolirod.weebly.com/uploads/1/3/1/3/131379111/lufej_zuzidopomugej_fazisaka.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386092/normal_5ff0a78b895bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480170/normal_60548d5b2f4df.pdfIn PDF document text
    • https://linazoforup.weebly.com/uploads/1/3/0/8/130814758/2462591.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382190/normal_5ff68569792ff.pdfIn PDF document text
    • https://jipagulus.weebly.com/uploads/1/3/1/3/131379543/xovatam.pdfIn PDF document text
    • https://mujubafajereked.weebly.com/uploads/1/3/4/5/134595908/6252655.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370989/normal_5fcd75e2a42a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492918/normal_6004b842283b6.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/fb2f370b-6d00-43d9-8c97-e7a16ceaba45/purodexininifimesodod.pdfIn PDF document text
    • http://tufukamapaf.pbworks.com/w/file/fetch/144499608/how_to_reset_schlage_encode_keypad_lock.pdfIn PDF document text
    • http://ragasegena.pbworks.com/f/98943707218.pdfIn PDF document text
    • http://sirazumebow.pbworks.com/w/file/fetch/144581268/40434149746.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7fce6e9-5d19-4e31-bb2e-7800a319a164/tres_metros_sobre_el_cielo_3_trailer.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/f/what_is_the_relationship_between_empirical_and_molecular_formula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0502f523-b3ed-4585-a20a-ebd14968f4de/little_fires_everywhere_how_many_episodes_in_season_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9da5ea42-5fc0-4fe5-b5a0-071e57d5dba2/esl_listening_phrasal_verbs.pdfIn PDF document text
    • http://molitutolu.pbworks.com/f/35306676078.pdfIn PDF document text
    • http://fuxedemama.pbworks.com/f/3784712857.pdfIn PDF document text
    • http://liguduper.pbworks.com/f/85018052907.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDE 5232 bytes
SHA-256: ebcb60fd341d93109f7893e4efbceecf2ec640af97f201389e50fafde200c3e1
font_01_sfnt_off0000f0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B4 10648 bytes
SHA-256: c1b44d339d3cbe4c578df87e3b5bfc26561a780a72734229bbe6210e5d097f64

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