PDF malware analysis — malicious · 91a78b60b39461aa

MALICIOUS

PDF

76.7 KB Created: 2021-02-16 06:09:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23

MD5: 47b699b7dda8354a86b7c8e6c28c73fe SHA-1: fddf654749b77a0986fb3dd7109888d03eac92ba SHA-256: 91a78b60b39461aadd7ea7d96d6c8c9c958dc5e0a630ed011e1d53abd28e0f38

206 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF document contains a large number of external links, many hosted on disposable domains or link farms, suggesting a phishing or scam campaign. The heuristic 'SE_CALLBACK_LURE' indicates the document is designed to trick users into calling a number for support or to resolve a billing issue, which is a common tactic for tech support scams. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
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://maypoin.ru/strik?utm_term=my+ge+refrigerator+water+and+ice+dispenser+not+working PDF link annotation
- https://cdn.sqhk.co/rasepotobami/aKhchbr/zined.pdfIn PDF document text
- http://megatorg.ru/zabazetow5bgl.pdfIn PDF document text
- https://cdn.sqhk.co/perikowep/jgigMYY/pexafasidanezubima.pdfIn PDF document text
- http://mestorating.ru/18217112784s0k9u.pdfIn PDF document text
- https://nadenekaf.weebly.com/uploads/1/3/0/7/130739264/0c1d62bf8e.pdfIn PDF document text
- http://byseles.xyz/tugadalekoziwomovuxygzel.pdfIn PDF document text
- https://cdn.sqhk.co/gituridewo/M1hb7gi/97352015968.pdfIn PDF document text
- https://cdn.sqhk.co/pabopimi/hjaRig4/finitog.pdfIn PDF document text
- https://cdn.sqhk.co/nogegamapagi/jjv8viV/31627175844.pdfIn PDF document text
- https://cdn.sqhk.co/xeduwukaxusa/1Wjifie/pinig.pdfIn PDF document text
- https://cdn.sqhk.co/tijinujul/ggFJ7bA/planetary_warfare_rts_battle_simulator.pdfIn PDF document text
- http://rufujatev.iblogger.org/59312548180.pdfIn PDF document text
- https://cdn.sqhk.co/pajokiman/hME1hhS/xixonug.pdfIn PDF document text
- https://cdn.sqhk.co/gixedomawa/idhdkzj/38306127308.pdfIn PDF document text
- http://drive4mclanemilwaukee.com/pojupixodekitoylaei.pdfIn PDF document text
- http://yourlivehelp.com/59716741549yk3pd.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://s3.amazonaws.com/dazutun/roselebirawemonufudu.pdfIn PDF document text
- https://s3.amazonaws.com/gapivegek/75027977988.pdfIn PDF document text
- https://s3.amazonaws.com/rutufokedizon/89923834548.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e157.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE157	5340 bytes
SHA-256: `f08256e3b01770e7d95821c5a03fec27a3bb1a552233fe4f8d678a2cdc9448cc`
`font_01_sfnt_off0000f3b0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF3B0	10336 bytes
SHA-256: `b2e58336e914897e65a75882b3665c6509201f9930b0a452a965d08faf043cb4`
`font_02_sfnt_off000116e0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x116E0	4324 bytes
SHA-256: `1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e`

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