Malicious PDF — malware analysis report

Static analysis result for SHA-256 6de4bfafa149f4fb…

MALICIOUS

PDF

75.9 KB Created: 2020-12-23 15:11:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3c87fd186f3d955effd87763ca52f5fe SHA-1: 94c08f818e38bf277cd4dd3927c77f2e08a3b496 SHA-256: 6de4bfafa149f4fb5d7dc9463d4be2bc1d75e9961fefe02c0c05d71ce6cdab0b
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting, and one specifically to a known malicious redirector. This indicates a link farm designed to either phish users or manipulate search engine results. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/aws?utm_term=sheet+metal+die+maker+in+delhi In PDF document text
    • https://bididanigatozum.weebly.com/uploads/1/3/4/3/134314142/vekaxivusiw.pdfIn PDF document text
    • https://tiposowa.weebly.com/uploads/1/3/1/1/131164246/7188618.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383929/normal_5fb2c806bc4bb.pdfIn PDF document text
    • https://fulipevaxavu.weebly.com/uploads/1/3/2/6/132695351/725891.pdfIn PDF document text
    • https://mepafuxutare.weebly.com/uploads/1/3/4/6/134660934/gosifigodasawi-dizowuxu-dazorodeviv-bulapivuzuwile.pdfIn PDF document text
    • https://banetopebored.weebly.com/uploads/1/3/4/8/134874573/majeroj.pdfIn PDF document text
    • https://xagegebalelil.weebly.com/uploads/1/3/4/5/134579129/01e027532f67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372105/normal_5fa50849037ef.pdfIn PDF document text
    • https://worivoka.weebly.com/uploads/1/3/4/5/134588103/babipegumajag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409421/normal_5fc2bdaf5510d.pdfIn PDF document text
    • https://kosilamegorigi.weebly.com/uploads/1/3/1/4/131409210/xifeza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/memul/33320441148.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/fems_microbiology_reviews_author_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caf4fc47-5ff6-4186-9819-59e108d8cf0b/gowibovejugeruzalij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20916143-9437-4bf5-8b3e-4d3f9bf44c61/zutewoki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ff6484e-fadc-4948-81a4-5b182d8c5a11/beasley_the_dog_weight.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/good_pedometer_app_for_android.pdfIn 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
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A9 5052 bytes
SHA-256: a52ce7f69690d55ea94dcdfee42734384681adf283bca57d9090347a4b48cffb
font_01_sfnt_off0000e8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A8 10624 bytes
SHA-256: b5b426e876210e9a26a8b5c0f0f3a859cdb7b7151089d89ef2a31fcb5874be69
font_02_sfnt_off00010cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDD 16164 bytes
SHA-256: e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6