Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b7619354ce490bd…

MALICIOUS

PDF

80.6 KB Created: 2021-03-25 04:02:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 459462ac8ea11414d3a5ac1635d26ad3 SHA-1: d23f681542d2b034e1d6e0f7505f38098eed4c75 SHA-256: 3b7619354ce490bd62d8d76e6f559ee72d2e9e6430601101c5949ee5471b0693
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms and phishing. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, suggesting an attempt to drive traffic to potentially malicious sites. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-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://pelibifir.ru/strik?utm_term=graphing+exponential+functions+worksheet+answer+key
    • https://mawikimame.weebly.com/uploads/1/3/4/2/134235565/peral.pdf
    • https://ponawexem.weebly.com/uploads/1/3/2/7/132740185/pisisujawe-jajaxugidedopul-begekirogab.pdf
    • https://tatazazotogowe.weebly.com/uploads/1/3/4/6/134618267/4b0438c2f14cd20.pdf
    • http://yellownatural.space/the_boy_in_the_striped_pajamas_discussion_questionsyvs3z.pdf
    • http://fredo.run/versus_the_elite_trials_guidemgqik.pdf
    • http://copyrightnotice-ig.com/jibizeferikanejiseptqkhl.pdf
    • http://characduwe.space/106546913225yqeh.pdf
    • https://pikoxujedogusu.weebly.com/uploads/1/3/4/6/134665618/49561c144b501e7.pdf
    • https://japapetokanov.weebly.com/uploads/1/3/1/4/131454126/1030882.pdf
    • http://itrom.fun/lexemas_y_morfemas_ejercicios_bachilaav91.pdf
    • https://tuwozuzoleza.weebly.com/uploads/1/3/4/5/134509843/fapelekuxukimew.pdf
    • https://vakinora.weebly.com/uploads/1/3/1/8/131857586/6558615.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0c698485-220f-4880-9457-6757cafb1109/piranha_pit_bike_for_sale_near_me.pdf
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_8849ab4d7d174358acede1597632d680.pdf?index=true
    • https://uploads.strikinglycdn.com/files/353978af-7746-4722-9827-ddd6bb817447/70129839449.pdf
    • https://s3.amazonaws.com/folexapurilowe/lesotho_hip_hop_music_free.pdf
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_c406363759584063bdb298e71c498378.pdf?index=true
    • https://s3.amazonaws.com/mubefula/full_details_about_upsc_exam.pdf
    • https://s3.amazonaws.com/busutafitufe/zamifezagezupo.pdf
    • https://315736c7-1030-4200-8d24-05c9f4951019.filesusr.com/ugd/d19ca0_8061aff986b94f0ebb64b268d84edc41.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
    • 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_off0000e1f2.bin
d2e17d328e6cdac8467690107cab5a2e8432895439c658c1de50a1b74cdc29e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F2 5632 bytes
font_01_sfnt_off0000f544.bin
78355596280d7f407463dbef0807390dee277dd154e467a3ad1d7eccae66b9ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF544 11924 bytes
font_02_sfnt_off00011e3c.bin
713933360072c9d59346590fad668f98c3603c6d2b72ed941ce85481f6af0b74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3C 16060 bytes

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