Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ab1637fd27c50a…

MALICIOUS

PDF

76.2 KB Created: 2021-07-17 22:20:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 12416b8716298492af883b3ecd55cf13 SHA-1: 03fedb56670ed61fb7e6c3a95fffdf7475b0e47e SHA-256: 99ab1637fd27c50a8aa5a0203efef40df85cf26e5ff8f4bb091db77c27021545
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, though some are marked benign, suggests a potential phishing or credential harvesting attempt. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8907

Heuristics 4

  • 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://feedproxy.google.com/~r/sq/ugae/~3/CcIy6vlvkUk/square?utm_term=mvc+interview+questions+and+answers+for+freshers
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec867cc3fb560d26f330de/1626113661101/acnl_dynamic_painting.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7d122687a3d659a4bba72/1625805090182/kudapiwalubab.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60edace2e0c6fb6066154844/1626189026663/journal_carbohydrate.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f04a939fc4bf40b792e40b/1626360467447/fulipoxa.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60edaa0f573bc4731c8aac48/1626188303419/dixesojulozurokin.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f057253ab9101ab6a594d0/1626363685699/88594061530.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://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_off0000c5a2.bin
5f1a3b79537cc70f001cd38b72f38258f7ccbfb7b32cdb666f6a1bcb0ea88be0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A2 16956 bytes
font_01_sfnt_off0000f194.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF194 16792 bytes
font_02_sfnt_off000109ab.bin
0498e48c222358fdd758fe619383a550673c3cca81855c64b0fadec98f208697		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109AB 10916 bytes

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