Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c29a1b6372365d9…

MALICIOUS

PDF

76.3 KB Created: 2021-03-22 00:14:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a54de3da48efe449775fabdfb8ba49c SHA-1: b582dfa3cc2345e61a18a4d26be4888392a4a35d SHA-256: 1c29a1b6372365d9c0ba8e949894fcf1722c1c6d40ddbfa622d52d2ddef65ba5
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. While no scripts were explicitly extracted, the presence of numerous external URLs suggests a phishing or malicious redirection attempt, likely initiated via spearphishing attachment. The document body, though heavily obfuscated, contains text related to 'Bond energy chem worksheet answers', indicating a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/wix?keyword=bond+energy+chem+worksheet+16-2+answers
    • http://fosijez.22web.org/48333294866.pdf
    • https://cdn-cms.f-static.net/uploads/4443372/normal_6026f9b5e6c4d.pdf
    • https://cdn-cms.f-static.net/uploads/4388839/normal_5fe976a3d0e1c.pdf
    • https://cdn-cms.f-static.net/uploads/4417206/normal_600afcfe60298.pdf
    • https://static.s123-cdn-static.com/uploads/4494140/normal_5fed4319afff6.pdf
    • http://kafalukuwemi.mygamesonline.org/asleep_the_smiths_piano.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://daponub.epizy.com/bmrcl_result_2019_key_answers.pdf
    • http://sutexuvidag.myartsonline.com/evs_project_on_water_pollution_in_marathi.pdf
    • https://409b2d23-5c1d-402e-97df-26c0da9299b0.filesusr.com/ugd/2e3d42_b0c1b937924a407486431e67d507f191.pdf?index=true
    • https://9e2b3e3a-6a02-4d3b-8ba9-5acc01041672.filesusr.com/ugd/66c878_82d4b2cd1a28482eb4f7c636e0c2f279.pdf?index=true
    • https://02314edc-d025-420b-9d62-795437f25c47.filesusr.com/ugd/4f0fc1_ca5b0a1d17f1423aa93ea78698a63361.pdf?index=true
    • https://1f2f8e77-98df-4c5e-b88a-83bc2b612b58.filesusr.com/ugd/5c7528_45f69037d93546da816a4e8f035db3ab.pdf?index=true
    • https://s3.amazonaws.com/bojafazes/is_11255_part_5.pdf
    • http://miduzusajaveg.rf.gd/sama_veda_malayalam.pdf
    • https://e0f910ba-f4aa-4d6b-87f6-24d78cda99ab.filesusr.com/ugd/cc15ef_ea49ed475c8043dbb8a0e92ab5dc6270.pdf?index=true
    • https://s3.amazonaws.com/wuzalugiseto/24012426340.pdf
    • https://81866859-049a-499f-9904-b5dd27b5453f.filesusr.com/ugd/84a5c6_d7fa908cddbd4e16829599924aeb8fad.pdf?index=true
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_b3c6c743040248b288ac85b06aea89db.pdf?index=true
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_270d1786796f474aa6d0f6a8b655e41e.pdf?index=true
    • http://widusop.atwebpages.com/7436030464.pdf
    • http://majezomisi.myartsonline.com/73740791654.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d379.bin
7d82622adc4dad8b99820ce7abf81c5e30ba4dbca776d2f0f558ec75360bec63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD379 5996 bytes
font_01_sfnt_off0000e7e1.bin
8e42044101b4b1b31f66b1b45596a02eff09f3ad720610736541127b2c6429d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E1 11372 bytes
font_02_sfnt_off00010e41.bin
00468df452218f546d59995a7cf9b4297092e2fd476dbd2f6ce79846bd051107		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E41 16140 bytes

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