Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91c87a6846b376c…

MALICIOUS

PDF

138.7 KB Created: 2020-04-17 17:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 939c067cd0bf425b9b6015b310e8ea9a SHA-1: 57752627d181f87b3e86741c0bf10f5c9b909d5a SHA-256: d91c87a6846b376c01690af674c5d7abadb1a49702513faa107534b77075dc51
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, a common technique for SEO poisoning or directing users to malicious sites. The document body mentions 'Facebook dark mode 2019 apk', suggesting a lure to download a fake application. The primary heuristic identified a link farm structure, indicating a coordinated effort to distribute links across multiple domains. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 4

  • 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.
  • 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 http://aulan.world/uploads/1/3/0/5/130543318/130543318.html#facebook+dark+mode+2019+apk PDF link annotation
    • http://weddingsbyzaib.com/uploads/1/3/0/8/130813992/finigipepil_jemokivadirol_mufoku.pdfIn PDF document text
    • http://meridianadvisorsusa.net/uploads/1/3/0/6/130620861/ce0962cfa8a0549.pdfIn PDF document text
    • http://artbyjohnmarquard.com/uploads/1/3/0/5/130541137/5b862ce52f3.pdfIn PDF document text
    • http://maggiesaersfoodforliving.com/uploads/1/3/0/5/130546593/sigifezex.pdfIn PDF document text
    • http://kaspentravel.com/uploads/1/3/0/6/130621940/jizudo_dezudisorene_wazim_tekud.pdfIn PDF document text
    • http://photographybylaceyli.com/uploads/1/3/1/3/131398582/depatanetinupimin.pdfIn PDF document text
    • http://rockymtnfirepro.com/uploads/1/3/0/6/130621809/botelunitixal_nipivinifop_wakugulufi.pdfIn PDF document text
    • http://cpicweb.com/uploads/1/3/0/5/130541677/4090999.pdfIn PDF document text
    • http://leftbanklegend.be/uploads/1/3/0/9/130969624/lelaxijigulopo.pdfIn PDF document text
    • http://devhost.bajaj(6thIn PDF document text
    • https://ibotpeaches.g(19thIn PDF document text
    • http://www..com/8VPIn PDF document text
    • http://devhostIn PDF document text
    • https://play.(17thIn PDF document text
    • https://ibotpeaches.eIn PDF document text
    • https://www.go(20thIn PDF document text
    • http://db.(31stIn PDF document text
    • https://www.webnodeIn PDF document text
    • https://play.androidfilehost.0In PDF document text
    • http://b-boytm.com/?fid=24052804347853398In PDF document text
    • https://onedriveIn PDF document text
    • http://forum..resat(21stIn PDF document text
    • http://b-boytmIn PDF document text
    • http://devhost.androidfilehostIn PDF document text
    • http://devhost.twit(13thIn PDF document text
    • http://devhost.apkIn PDF document text
    • http://devhost.1980(4thIn PDF document text
    • http://db.WeWe(17thIn PDF document text
    • http://devhost...::WD40::.apkIn PDF document text
    • http://devhost.bajajIn PDF document text
    • https://www.com/?fid=24052804347844657In PDF document text
    • https://androidfilehost.com/store/apps/d.orIn PDF document text
    • https://www.com/store/apps/d.AIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
🗂 Part of campaign: koshkanusya.com 3 samples

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001cf1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF1E 11288 bytes
SHA-256: 2d5439c4e2e6ea0f90ddafc761632ec838f9b6ac1d3dd5a3a2423f351b14cb69
font_01_sfnt_off0001f7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F7B8 2884 bytes
SHA-256: 7ac8759f6f71c33f8f5bad5d2fe86e28dd137252f4eb086882e54a8c447c5691
font_02_sfnt_off000203e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x203E7 17356 bytes
SHA-256: 190c9b76a23ffe75e33c15d2e2b06e0338ec12440b018d1794016b0017697eee

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