Malicious PDF — malware analysis report

Static analysis result for SHA-256 6acfcb0fd1b49ca0…

MALICIOUS

PDF

74.8 KB Created: 2021-04-06 11:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 24ae00817e82e5f2bc55ec4ab7d7fe32 SHA-1: b2ef7e1c79d305e5b3db751c79acce0bb89e84d8 SHA-256: 6acfcb0fd1b49ca0bb227ca87cee78801cbc5a66bea9838d83c85d2da1580e2e
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. The document body, though heavily obfuscated, suggests a theme related to changing subjects in debates, likely a pretext to disguise the malicious link.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=changing+the+subject+in+a+debate In PDF document text
    • https://cdn-cms.f-static.net/uploads/4393349/normal_60329e76dd1a4.pdfIn PDF document text
    • https://cdn.sqhk.co/jaguwubax/Tyjjngf/super_jungle_world_apk_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485704/normal_603d42e717f80.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477386/normal_5fede16e4552d.pdfIn PDF document text
    • https://vususutuf.weebly.com/uploads/1/3/4/6/134634118/futira.pdfIn PDF document text
    • https://cdn.sqhk.co/pamavunawi/japCHib/auto_repeat_player_apk.pdfIn PDF document text
    • https://navolujute.weebly.com/uploads/1/3/1/4/131483334/e5ef8a2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380871/normal_6046472703ca1.pdfIn PDF document text
    • https://cdn.sqhk.co/xotakuzazuf/hx0h7ih/doll_cake_designs_images.pdfIn PDF document text
    • https://vidowenabep.weebly.com/uploads/1/3/5/3/135322196/rodiwewimonoz_bibaz_zuwafoselaxo.pdfIn PDF document text
    • https://tivizaxif.weebly.com/uploads/1/3/1/3/131381605/vazinelebikikeb_motad_divod.pdfIn PDF document text
    • https://tixaradizu.weebly.com/uploads/1/3/4/6/134652762/sebijuba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495039/normal_604d45cc345b7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/daselex/3951076764.pdfIn PDF document text
    • https://s3.amazonaws.com/tubupejevomo/dogigapiwodutixuja.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/luzoz.pdfIn PDF document text
    • https://6d8b2927-5c4d-40df-b593-c6bd35e19528.filesusr.com/ugd/1adac8_4429711ed840456db2ff999ad9e4bf64.pdf?index=trueIn PDF document text
    • https://0cc2a7d0-6f33-4335-9ec9-554d9418487e.filesusr.com/ugd/cb4a18_90fe35bd8f1448eea1194aa44dffa6f9.pdf?index=trueIn 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_off0000e828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE828 5192 bytes
SHA-256: c611df812d6981705abff8ec7010f8d5d2549514c79a9f3c347d9109fb9178c9
font_01_sfnt_off0000f9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CC 10752 bytes
SHA-256: 31feb8f28603404e3beb845bc55efa5826e38c38379b4d940cc81f995def67e1

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