Malicious PDF — malware analysis report

Static analysis result for SHA-256 e37d79efbc77f541…

MALICIOUS

PDF

118.0 KB Created: 2021-04-04 07:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: cc2d6c96ed79c0ed9e0f6b1627674fcd SHA-1: ca501df48aa924c94967df3e3eb6dd3267a08192 SHA-256: e37d79efbc77f5413a530d693efabcb6ec525393fad332df8a12390fa4205f38
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to download lures, indicating a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs, such as 'https://druttle.ru/wix?keyword=minty+code+generator+real', are likely used to redirect users to malicious sites.

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
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://druttle.ru/wix?keyword=minty+code+generator+real PDF link annotation
    • http://lebepufu.mypressonline.com/understanding_pathophysiology_2nd_edition_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/guxuboru/ghdgjjb/general_tso_chicken_wings_instant_pot.pdfIn PDF document text
    • https://cdn.sqhk.co/rajemaramiw/icsPif6/clover_earn_perks_nearby_order_ahead.pdfIn PDF document text
    • http://digitalliteracyinstitute.com/53128067929cqtb4.pdfIn PDF document text
    • https://cdn.sqhk.co/dobajinorite/3gchecs/zijemajeji.pdfIn PDF document text
    • http://austritkfa.com/susitinuvo1mac3.pdfIn PDF document text
    • http://xojuxelase.medianewsonline.com/akbar_birbal_story_in_english_download.pdfIn PDF document text
    • http://vuxilenusip.mypressonline.com/pandora_ring_size_guide_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/xufaribo/bH1Odgi/828449837.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/xufaxoferugod/answers_in_genesis_ark_encounter.pdfIn PDF document text
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_ec3a394f5f7c4aaa8c40f25fb240865c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/42394845130.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/goodwill_in_spanish_language.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/agnus_dei_chords_key_of_a.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6809fa04-c448-40b2-906f-fe3f8efe7411/36325508534.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/934a8490-cf83-4501-b6f6-42a24304e0b4/dejaluviba.pdfIn PDF document text
    • https://1e35b969-1f99-48dc-8aa8-d0fb9638bdc8.filesusr.com/ugd/970baa_23206de1d0bb49c0877c08113bd649e1.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000191b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191B9 5036 bytes
SHA-256: 6003d90ca18e2831d9835b1581fea3fcfbd7344174facfa9d19935e851fc69e0
font_01_sfnt_off0001a2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2FC 11760 bytes
SHA-256: 1b2ffae1b03b0aaa53d366968ea97df44f6e46fac48f4f7b0cfaebcc10d4a585

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