Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f7ffb951443826…

MALICIOUS

PDF

72.1 KB Created: 2021-06-05 05:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: e2264ad86295a598f8aab405a1a5e816 SHA-1: d614788093806abbb0c1516ac1b14f082e9ff587 SHA-256: f7f7ffb951443826557564664155fb20140fb2f371c4d5e831d57268e92b395d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, many hosted on disposable domains, indicating a link farm designed for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution through these links. The document body, though corrupted, suggests a lure related to 'Dell optiplex 9020 instructions'.

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
  • 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.
  • 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://cructi.ru/pbw?utm_term=dell+optiplex+9020+instructions PDF link annotation
    • https://tunopukiku.weebly.com/uploads/1/3/4/7/134775633/vajupup.pdfIn PDF document text
    • https://wokepugef.weebly.com/uploads/1/3/4/9/134901336/pakanimikif.pdfIn PDF document text
    • https://nupuwuzom.weebly.com/uploads/1/3/1/4/131438231/novux.pdfIn PDF document text
    • https://veralekixa.weebly.com/uploads/1/3/1/0/131069874/zefevij.pdfIn PDF document text
    • https://lovevupadu.weebly.com/uploads/1/3/5/3/135328586/mifidotenawunol.pdfIn PDF document text
    • https://zomasaxejis.weebly.com/uploads/1/3/4/3/134325580/mifukobiki.pdfIn PDF document text
    • https://porujigiwafixuf.weebly.com/uploads/1/3/4/3/134373975/b93e6.pdfIn PDF document text
    • https://fugogifozu.weebly.com/uploads/1/3/4/8/134888696/puwivifoxe.pdfIn PDF document text
    • https://fovezifume.weebly.com/uploads/1/3/0/8/130874198/mewux-lizuvagepi.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/1d3425ea-429c-48ef-a645-ef5a256c54a9/42542526663.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f1942fb-e0e3-4a96-8038-5d97d7231c2b/charting_outcomes_in_the_match_2018_fellowship.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb0fe957-24cd-420b-aaeb-7c591b333dd8/what_is_a_nursing_care_delivery_model.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1312f0d0-0cfe-4b5c-8651-5a592b531912/tafamukirakariwinu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6523252c-b782-49e2-a10c-90a07ffc9624/bivaporima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b48713a3-29e0-4842-96aa-d062d19af971/gunugid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4aba460a-4397-48f0-8494-a31fb9f4cf4c/vinujozokeneziguwefaxap.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_off0000dc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4F 5212 bytes
SHA-256: 19e941418ecfa136910f734cf6cb2940e05fe9a510540acce33f7cbddfe9a623
font_01_sfnt_off0000ee2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2C 11572 bytes
SHA-256: 1077cfed9673c2e2415bde427e299274ccbeeebf0a65874416357c88fecf8018

Open this report in the interactive analyzer, or submit your own file for analysis.