Malicious PDF — malware analysis report

Static analysis result for SHA-256 88db127c4f4376f0…

MALICIOUS

PDF

86.2 KB Created: 2020-04-11 16:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: f125d31cbe390eb9afeef3b47401c0c5 SHA-1: 2922f7c6a63f7e17913e74bc1b403fe457e76b0b SHA-256: 88db127c4f4376f07941fe90808ede8c5899d071147942834c0b3672fd6baa06
116 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are structured as PDF files with numeric slugs, indicative of a link farm. The heuristic 'SE_CALLBACK_LURE' suggests a phishing or scam pretext, likely using the document's content to trick users into visiting these URLs. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://billiardeyeglasses.com/uploads/1/3/1/4/131407253/131407253.html#iec+61850+engineering+guide+abb PDF link annotation
    • http://mountainhighs.net/uploads/1/3/1/4/131454731/d7b31e.pdfIn PDF document text
    • http://alicia-stop-n-shop.com/uploads/1/3/0/2/130289629/mivijafun_sevevowofip_ridewajel_tusuvaviruxuna.pdfIn PDF document text
    • http://vestosbasics.com/uploads/1/3/0/3/130324044/topepolewudapiwasuna.pdfIn PDF document text
    • http://naaboard.com/uploads/1/3/0/9/130969419/fe191f308e2.pdfIn PDF document text
    • http://margiemademe.com/uploads/1/3/0/5/130540645/f590b04bf0f36bc.pdfIn PDF document text
    • http://primerbatallon.com/uploads/1/3/0/5/130547418/zuminajudekud.pdfIn PDF document text
    • http://tachmanagementsolutionsltd.com/uploads/1/3/1/6/131637529/bejilowaza.pdfIn PDF document text
    • http://innova-publicrelations.com/uploads/1/3/0/5/130541221/xinul_tilav_sigufemab.pdfIn PDF document text
    • http://everestdobie.com/uploads/1/3/0/4/130476669/4654339.pdfIn PDF document text
    • http://meiliphotography.com/uploads/1/3/0/7/130739175/f54dc6bb119.pdfIn PDF document text
    • http://kobtracz.pl/uploads/1/3/0/7/130775920/201106.pdfIn PDF document text
    • http://aotkburkina.org/uploads/1/3/0/7/130740250/pusuzetuvutuxiwedof.pdfIn PDF document text
    • http://baliagainstaids.org/uploads/1/3/0/4/130483810/9483654.pdfIn PDF document text
    • http://cpanel.smithandcrumble.co.uk/uploads/1/3/0/7/130776408/nubunuxapasununigebu.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
    • 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

Related samples 1

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11851 6416 bytes
SHA-256: dba346b9230e27086c7768abd383d4e7e4ae6cc2418a1ccb37d4e9482484cf1e
font_01_sfnt_off000127e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E4 8940 bytes
SHA-256: 32c894446c7a1e93b8482f791aeef66809ef57f8a37811a35d3369db62443cf3

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