PDF malware analysis — malicious · 077af3c3b97fc935

MALICIOUS

PDF

64.6 KB Created: 2020-12-18 01:41:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 1a4fd65c8653e98a46c69e0723bece57 SHA-1: 791ae569ed60ff907173fe0c964b15b88eac9756 SHA-256: 077af3c3b97fc935f34e40a28c1f6dd08ae1b9b21f20977846cf5ecc8f338b57

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which appear to be SEO-optimized book download lures. The heuristic PDF_SEO_LINK_FARM indicates a deliberate attempt to create a link farm, likely for malicious purposes such as phishing or distributing further malware. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 5

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.
ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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://trafficel.ru/123?utm_term=grow+the+f+up+book+pdf+free
- https://nuwuzeparagagux.weebly.com/uploads/1/3/4/8/134883197/beluwinamu.pdf
- https://nibawomufexax.weebly.com/uploads/1/3/4/3/134371272/5fdc18bcb.pdf
- https://cdn-cms.f-static.net/uploads/4418746/normal_5fa2087778332.pdf
- https://static.s123-cdn-static.com/uploads/4471945/normal_5fc42ac578197.pdf
- https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/punaju.pdf
- https://cdn-cms.f-static.net/uploads/4494668/normal_5fd6489b806e7.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://uploads.strikinglycdn.com/files/f1c1a147-3022-4a93-a7e4-72020da7f94b/earl_sweatshirt_some_rap_songs_downl.pdf
- https://uploads.strikinglycdn.com/files/92bb69b2-3c0d-4e69-ac3c-5d053d38bb1b/lutikusamako.pdf
- https://s3.amazonaws.com/sigobija/zaguwe.pdf
- https://uploads.strikinglycdn.com/files/0e452c74-3073-4d24-bab8-72ed2d72a795/hp_color_laserjet_cp4525_manual.pdf
- https://uploads.strikinglycdn.com/files/934ae742-6292-4ad0-8f1c-22d2625aa051/29817154309.pdf
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/xap/1.0/rights/
- http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000c0d1.bin` `e84dbc9386d2fc739b3827042b7cfe7a017028ff1b9e784809eaf9d8a31a188f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC0D1	5036 bytes
`font_01_sfnt_off0000d1fc.bin` `6765e57e25d47ce59fcf23fc802653388cee54f65d493829d2a5b13d902ddce0`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD1FC	10500 bytes

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