Malicious PDF — malware analysis report

Static analysis result for SHA-256 27442a6b416bd707…

MALICIOUS

PDF

82.7 KB Created: 2021-03-14 09:21:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f413f6d9ea26d49af5db9b2b938af82 SHA-1: 77a3fb58855866a0db7b759e68f056e3253760fc SHA-256: 27442a6b416bd707523f815c8f71748d65605137a4117a2e562d9d167a94b5d0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the 'PDF_SEO_LINK_FARM' heuristic, directing to potentially malicious domains. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics confirm its malicious nature, with ClamAV identifying it as a phishing trojan. The embedded URLs suggest an attempt to lure users to phishing sites or download further malicious content.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=toyota+camry+ascent+hybrid+2018+review
    • http://cashtanks.fun/pengertian_platform_menurut_para_ahli44gyi.pdf
    • http://igme.site/sijitonigimuto1fzi2.pdf
    • http://vvvvvvvvvvvvvvvvvvvvvb.xyz/how_to_start_an_occupational_therapy_practiceh6z2a.pdf
    • http://sodalabs.pro/everstart_maxx_jump_starter_1200_reviews0ax5.pdf
    • http://bitjoms.xyz/twilight_saga_eclipse_summaryf3pwe.pdf
    • http://mivetys.xyz/missing_411_book_series_order0rerp.pdf
    • http://biniwitovo.mywebcommunity.org/barron_s_sat_test.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://61df3396-90b5-4b69-a3ae-475c9da6ebc5.filesusr.com/ugd/516574_5a775f1eebb54b61815bba87b27e11c7.pdf?index=true
    • https://s3.amazonaws.com/tuzakifezara/fobilubulememe.pdf
    • https://02314edc-d025-420b-9d62-795437f25c47.filesusr.com/ugd/4f0fc1_21e771a065304927b9b7a15fb8e6fb83.pdf?index=true
    • http://bebovufuvuji.myartsonline.com/digemigosopadifamuxubija.pdf
    • https://s3.amazonaws.com/bidemewufa/93362921880.pdf
    • https://s3.amazonaws.com/tuletivotarupu/4974712916.pdf
    • https://s3.amazonaws.com/wutisigila/media_player_classic_for_windows.pdf
    • https://7a9095e9-4ba3-4ff7-9406-a75d0382ce8a.filesusr.com/ugd/db93e9_66e425467e1445929151c2ae67ce7a01.pdf?index=true
    • https://8d537faf-e869-4ed9-a29f-988560fab1dc.filesusr.com/ugd/0cce51_6780bee000bd4816b6112f5e16ef3b1b.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f67d.bin
05183572049e6e17981e77f493115b4736fa7ab2baefe162b289e9a9f021f341		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF67D 5796 bytes
font_01_sfnt_off00010a1a.bin
aa00ba7fd7402a48163faff5d89b459b35101196f8a23859e4050a9408b8dab4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1A 10836 bytes
font_02_sfnt_off00012f2b.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2B 4324 bytes

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