Malicious PDF — malware analysis report

Static analysis result for SHA-256 be1ffdfab87787aa…

MALICIOUS

PDF

82.4 KB Created: 2021-03-27 18:10:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 83fcfb7ffe3243836460dfb8c597828a SHA-1: 307a97787268e738ed6a8759edd28d63013f96bd SHA-256: be1ffdfab87787aa4add59cab12ca14bdd7f36793a5e7ff29b2d2d77d9d321da
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs pointing to various domains, suggesting an attempt to redirect users to potentially malicious or phishing sites. The presence of multiple external links on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wix?keyword=marshalltown+concrete+tools PDF link annotation
    • https://cdn.sqhk.co/mibupufek/gglygeC/arcade1up_pinball_gamestop.pdfIn PDF document text
    • http://dalifajebuxog.scienceontheweb.net/menebimadagodutiv.pdfIn PDF document text
    • https://gemunokixelu.weebly.com/uploads/1/3/6/0/136095878/5feb326b5d.pdfIn PDF document text
    • https://cdn.sqhk.co/dubutemaruxu/hh2hegj/bucket_list_things_to_do_in_colorado.pdfIn PDF document text
    • http://topvideo.design/6182280203094ow8.pdfIn PDF document text
    • http://krokoboko3.xyz/freestyle_shark_classic_watch_reviewv4471.pdfIn PDF document text
    • https://setozovijigaze.weebly.com/uploads/1/3/4/3/134383391/4359140.pdfIn PDF document text
    • http://storezone.info/5700270643682wgi.pdfIn PDF document text
    • https://cdn.sqhk.co/nixibaraje/cdUkgiE/vowonokono.pdfIn PDF document text
    • http://nozumupi.medianewsonline.com/95433465744.pdfIn PDF document text
    • https://lokevevivepino.weebly.com/uploads/1/3/4/1/134131736/0c2da4aa0.pdfIn PDF document text
    • https://cdn.sqhk.co/jonosefo/heij5Wi/receipt_sample_format.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://webmastervlad.ru/niwamodoziwemogawomunuf7snxe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_a2d02fa56e764b92b0d2e2e4fdda2d82.pdf?index=trueIn PDF document text
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_4527dd4fbcc54e459f2b4ef315db8686.pdf?index=trueIn PDF document text
    • http://totefopige.atwebpages.com/mawitetewusalovanuzuno.pdfIn PDF document text
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_463826cfdaa74d1f8aab8770fb92c8aa.pdf?index=trueIn PDF document text
    • https://ba85394b-11ac-4ca4-926b-74ca936c52e1.filesusr.com/ugd/5ccfc8_a341b4c7af8f41fea3d5ae90d31b0870.pdf?index=trueIn PDF document text
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_5e46f035e31f47dc887d6546dade0ee6.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD550 6440 bytes
SHA-256: edf517a561ed5132c6c1d5718ac6ff9d870a00e6f43a91762fd168a2279cca75
font_01_sfnt_off0000e546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE546 4984 bytes
SHA-256: c89db4b3289135d28c4fa1ea754e7ad97590208ca276e16a40260d68d0acbc78
font_02_sfnt_off0000f646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF646 1936 bytes
SHA-256: cf50d13c5c21d2e34fba0d9dd21119d4839fc35fdaebfe62cbacf51850cc328d
font_03_sfnt_off0000ff85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF85 11064 bytes
SHA-256: 56d584394e1e9271318329f745e4a50feb84630c37a661ee5e21c2da2d31a898
font_04_sfnt_off0001255f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255F 16036 bytes
SHA-256: 149cab45689013e99d1aa520d2e5234663aa5d8577b6aae5e423b5d60aeda4c1

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