Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9210900a857e4f4…

MALICIOUS

PDF

107.6 KB Created: 2021-04-06 23:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 49cd54b0b6acd94539c4c6e00e8b26f2 SHA-1: 571119894920922454261a4ad3c8e6d7a1361905 SHA-256: b9210900a857e4f4bfa5cb51023879697ceec1653794681f2f6d4c26a79c40b1
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 as a link farm, with one primary URL pointing to a potentially malicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to a network of sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://dafemum.ru/award?keyword=appdynamics+tutorial+pdf
    • https://cdn.sqhk.co/tiwoxebu/gifgiRI/sandwich_recipes_for_dinner_party.pdf
    • https://cdn.sqhk.co/nulupitet/facjbQW/adobe_photoshop_cs5_free_crack_version.pdf
    • https://ribugasa.weebly.com/uploads/1/3/6/0/136053023/vedogo.pdf
    • https://cdn.sqhk.co/romekeka/eibChdL/jarubidesujiwuxobokamoze.pdf
    • https://cdn-cms.f-static.net/uploads/4368221/normal_602d49ee0b2ec.pdf
    • http://edalovert.xyz/bugeditavizeskrxq2.pdf
    • https://wonumajogo.weebly.com/uploads/1/3/1/3/131379434/ruvukob.pdf
    • https://cdn.sqhk.co/nunexijezep/d09jbih/callaway_gardens_georgia_christmas.pdf
    • https://cdn.sqhk.co/woselukafo/at4ajbp/free_video_poker_for_iphone.pdf
    • https://static.s123-cdn-static.com/uploads/4368752/normal_5fe495508f826.pdf
    • https://cdn.sqhk.co/jowapezo/Qk4hbbg/rujerajapuzawa.pdf
    • https://static.s123-cdn-static.com/uploads/4413019/normal_5fe5e416e6c90.pdf
    • https://cdn-cms.f-static.net/uploads/4382196/normal_605f6d141faf1.pdf
    • http://livethailand.fun/2199332778lub22.pdf
    • https://cdn.sqhk.co/xokekekav/hSgcENK/short_hairstyles_2019_for_natural_black_hair.pdf
    • http://instasavephoto.com/gilufj4mfe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/566260f1-9dd6-409e-b038-dc214d1dcc62/power_pressure_cooker_xl_slow_cooker_recipes.pdf
    • https://uploads.strikinglycdn.com/files/b53445ee-4bbf-4d2d-b8f1-4e4e1a833117/bagigofimakuwi.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
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001207d.bin
ba470bf3150d6fc05399fae83910fb3c4502c7952215dbf47f2f23853f89328c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1207D 3100 bytes
font_01_sfnt_off00012b8e.bin
a75474f92d28e787371bba4ddac127435a6ca6b3b88167238e1207470a402e8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8E 5156 bytes
font_02_sfnt_off00013cf9.bin
b4cada5e2df3afef93a7ea6c68ac6d276a3dfb991b91a1a52c0beb9b3c78a19f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF9 13892 bytes
font_03_sfnt_off00016b72.bin
5938a0164db2f5c605a36de4efbfaa218989e9232e8846005949f1f022f649a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16B72 16712 bytes
font_04_sfnt_off000182cb.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x182CB 4324 bytes
font_05_sfnt_off0001908e.bin
69ade999641fd41732c6e7d9a39f276f136665a573b6470c252f14eb9dee5b32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1908E 6108 bytes

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